UPSTREAM: arm64: mm: Adopt new alternative assembler macros

Convert the dynamic patching for ARM64_WORKAROUND_CLEAN_CACHE over to
the newly added alternative assembler macros.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

Bug: 31432001
Change-Id: Iec89fd02a31ce30ab856ed459ff417843eeb96fc
(cherry picked from commit 271d35eb77d0f53177b44968417b630d1fee8b99)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>