arm64: kexec: Use dcache ops macros instead of open-coding

arm64: kexec: Use dcache ops macros instead of open-coding

kexec does dcache maintenance when it re-writes all memory. Our
dcache_by_line_op macro depends on reading the sanitized DminLine
from memory. Kexec may have overwritten this, so open-codes the
sequence.

dcache_by_line_op is a whole set of macros, it uses dcache_line_size
which uses read_ctr for the sanitsed DminLine. Reading the DminLine
is the first thing the dcache_by_line_op does.

Rename dcache_by_line_op dcache_by_myline_op and take DminLine as
an argument. Kexec can now use the slightly smaller macro.

This makes up-coming changes to the dcache maintenance easier on
the eye.

Code generated by the existing callers is unchanged.

Suggested-by: James Morse <james.morse@arm.com>
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210930143113.1502553-7-pasha.tatashin@soleen.com
Signed-off-by: Will Deacon <will@kernel.org>