tf700t: use NEON optimizations

Patch Set 2: Remove HAVE_32_BYTE_CACHE_LINE, it got reverted.
Patch Set 3: Only set ARCH_ARM_USE_NON_NEON_MEMCPY to true
Patch Set 4: mistakenly removed HAVE_32_BYTE_CACHE_LINE, added back

Change-Id: I2703b81d51addff92dfb3f2393eeedf20b6e466b