ANDROID: GKI: Revert "arm64: Remove unused macros from assembler.h"

This reverts commit <d3127afa>
("arm64: Remove unused macros from assembler.h")
This is required for flush_cache_all to work.

Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
(cherry picked from commit fe53b823dc0b351af902e752e2ba640d8a7422b4)
Bug: 153349826
Test: build
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I75e4af597bdec8d4e49abcdfef28e86b2f06c21b