of: address: Expand nonposted-mmio to non-Apple Silicon platforms

The nE memory attribute may be utilized by various implementations,
not limited to Apple Silicon platforms.

Drop the early CONFIG_ARCH_APPLE check.

Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250319-topic-nonposted_mmio-v1-1-dfb886fbd15f@oss.qualcomm.com


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>