Remove unused arm defines.

The defines HAVE_32_BYTE_CACHE_LINES and ARCH_ARM_USE_NON_NEON_MEMCPY
are not used by any code. The previous memcpy code that used these
has been split into different architecture versions to avoid the need
for them.

Bug: 8005082

Merge from internal master.

(cherry-picked from commit 6e1a5cf31ba47508b08dba02a45b4ea6e1edd6d2)

Change-Id: Ib18fc3f4131b21cdbd19b9dde7697ac25d066fcf
1 file changed