BACKPORT: arm64: Fold proc-macros.S into assembler.h

To allow the assembler macros defined in arch/arm64/mm/proc-macros.S to
be used outside the mm code move the contents of proc-macros.S to
asm/assembler.h.  Also, delete proc-macros.S, and fix up all references
to proc-macros.S.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
[rebased, included dcache_by_line_op]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

Bug: 31432001
Change-Id: I09e694442ffd25dcac864216d0369c9727ad0090
(cherry picked from commit 7b7293ae3dbd0a1965bf310b77fed5f9bb37bb93)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>