ci: Disable LLVM qemu_riscv32 testing

There are issues building tests for qemu_riscv32 using the LLVM
toolchain.

Revert this commit once these issues are fixed on the Zephyr side.

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

Author: stephanosio

.github/workflows/ci.yml

@@ -1766,7 +1766,8 @@ jobs:
 
           # Add RISC-V platforms
           ## RV32I
-          PLATFORM_ARGS+="-p qemu_riscv32 "
+          # FIXME: There are issues building some tests for qemu_riscv32.
+          # PLATFORM_ARGS+="-p qemu_riscv32 "
           ## RV32E
           PLATFORM_ARGS+="-p qemu_riscv32e "
           ## RV64I