src/poky:tune-cortexr52: Remove aarch64 for ARM Cortex-R52

Remove aarch64 for ARM Cortex-R52 processor as it supports only 32-bit
ISA but not 64-bit ISA. Also update ARMPKGARCH for cortexr52hf.

(From OE-Core rev: efe2e5289333bb6e7fca9cdeff784ab7e4872227)

Signed-off-by: Sandeep Gundlupet Raju <sandeep.gundlupet-rajuamd.com>
Signed-off-by: Sandeep Gundlupet Raju <grsandeep85gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briandbootlin.com>
Signed-off-by: Richard Purdie <richard.purdielinuxfoundation.org>

Author: grsandeep85