RISC-V: Build RV64 multilib with mcmodel=medany

This commit updates the Zephyr RISC-V multilib configurations to
explicitly specify `mcmodel=medany` when building the RV64 multilibs
because the GCC defaults to the `medlow` code model when the `mcmodel`
flag is not specified.

Note that the Zephyr build system builds the RV64 targets using the
`medany` code model because Zephyr uses the "flat" memory model and
the addressing capabilities of the `medlow` model is too limited for
it.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

Author: stephanosio

gcc/config/riscv/t-zephyr

@@ -64,14 +64,11 @@ march=rv32e_zicsr_zifencei/mabi=ilp32e \
 march=rv32em_zicsr_zifencei/mabi=ilp32e \
 march=rv32emc_zicsr_zifencei/mabi=ilp32e \
 march=rv32emc_zicsr_zifencei_zba_zbb_zbc_zbs/mabi=ilp32e \
-march=rv64i_zicsr_zifencei/mabi=lp64 \
-march=rv64im_zicsr_zifencei/mabi=lp64 \
-march=rv64im_zicsr_zifencei_zba_zbb_zbc_zbs/mabi=lp64 \
-march=rv64imac_zicsr_zifencei/mabi=lp64 \
-march=rv64imac_zicsr_zifencei_zba_zbb_zbc_zbs/mabi=lp64 \
-march=rv64imafdc_zicsr_zifencei/mabi=lp64d \
-march=rv64imafd_zicsr_zifencei/mabi=lp64d \
+march=rv64i_zicsr_zifencei/mabi=lp64/mcmodel=medany \
+march=rv64im_zicsr_zifencei/mabi=lp64/mcmodel=medany \
+march=rv64im_zicsr_zifencei_zba_zbb_zbc_zbs/mabi=lp64/mcmodel=medany \
 march=rv64imac_zicsr_zifencei/mabi=lp64/mcmodel=medany \
+march=rv64imac_zicsr_zifencei_zba_zbb_zbc_zbs/mabi=lp64/mcmodel=medany \
 march=rv64imafdc_zicsr_zifencei/mabi=lp64d/mcmodel=medany \
 march=rv64imafd_zicsr_zifencei/mabi=lp64d/mcmodel=medany
 
@@ -94,15 +91,15 @@ march.rv32e_zicsr_zifencei/mabi.ilp32e=march.rv32ec_zicsr_zifencei/mabi.ilp32e \
 march.rv32em_zicsr_zifencei/mabi.ilp32e=march.rv32ema_zicsr_zifencei/mabi.ilp32e \
 march.rv32emc_zicsr_zifencei/mabi.ilp32e=march.rv32emac_zicsr_zifencei/mabi.ilp32e \
 march.rv32emc_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.ilp32e=march.rv32emac_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.ilp32e \
-march.rv64i_zicsr_zifencei/mabi.lp64=march.rv64ia_zicsr_zifencei/mabi.lp64 \
-march.rv64i_zicsr_zifencei/mabi.lp64=march.rv64iac_zicsr_zifencei/mabi.lp64 \
-march.rv64i_zicsr_zifencei/mabi.lp64=march.rv64ic_zicsr_zifencei/mabi.lp64 \
-march.rv64im_zicsr_zifencei/mabi.lp64=march.rv64ima_zicsr_zifencei/mabi.lp64 \
-march.rv64im_zicsr_zifencei/mabi.lp64=march.rv64imc_zicsr_zifencei/mabi.lp64 \
-march.rv64im_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.lp64=march.rv64ima_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.lp64 \
-march.rv64im_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.lp64=march.rv64imc_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.lp64 \
-march.rv64imafdc_zicsr_zifencei/mabi.lp64d=march.rv64gc/mabi.lp64d \
-march.rv64imafd_zicsr_zifencei/mabi.lp64d=march.rv64g/mabi.lp64d
+march.rv64i_zicsr_zifencei/mabi.lp64/mcmodel.medany=march.rv64ia_zicsr_zifencei/mabi.lp64/mcmodel.medany \
+march.rv64i_zicsr_zifencei/mabi.lp64/mcmodel.medany=march.rv64iac_zicsr_zifencei/mabi.lp64/mcmodel.medany \
+march.rv64i_zicsr_zifencei/mabi.lp64/mcmodel.medany=march.rv64ic_zicsr_zifencei/mabi.lp64/mcmodel.medany \
+march.rv64im_zicsr_zifencei/mabi.lp64/mcmodel.medany=march.rv64ima_zicsr_zifencei/mabi.lp64/mcmodel.medany \
+march.rv64im_zicsr_zifencei/mabi.lp64/mcmodel.medany=march.rv64imc_zicsr_zifencei/mabi.lp64/mcmodel.medany \
+march.rv64im_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.lp64/mcmodel.medany=march.rv64ima_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.lp64/mcmodel.medany \
+march.rv64im_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.lp64/mcmodel.medany=march.rv64imc_zicsr_zifencei_zba_zbb_zbc_zbs/mabi.lp64/mcmodel.medany \
+march.rv64imafdc_zicsr_zifencei/mabi.lp64d/mcmodel.medany=march.rv64gc/mabi.lp64d/mcmodel.medany \
+march.rv64imafd_zicsr_zifencei/mabi.lp64d/mcmodel.medany=march.rv64g/mabi.lp64d/mcmodel.medany
 
 # Automatically generate multilib options and directory names from the target configurations
 space := $(subst ,, )