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
Change-Id: I14e0368c5bb4c3a80e72520f7cfd97e359918cce
1 file changed