arch: arm64: avoid invalidating of RO mem after mem map

The Cortex ARM documentation states that the DC IVAC instruction
requires write access permission to the virtual address (VA);
otherwise, it may generate a permission fault.

Therefore, it is needed to avoid invalidating read-only memory
after the memory map operation.

This issue has been produced by commit c9b534c4.
This commit resolves the issue #64758.

Signed-off-by: Mykola Kvach <mykola_kvach@epam.com>
(cherry picked from commit c4ffadb0)