Fix bionic optimizations: wow what a fail

In this change d50d77c7a088f544c2d5bd994fc97d172a831ce1 the wrong variables were added.  This is a automatic fail.

According to bionic's memcpy.S ARCH_ARM_HAVE_NEON_UNALIGNED_ACCESS should be NEON_UNALIGNED_ACCESS
See https://github.com/SaberMod/android_bionic/blob/sm-jb-mr1/libc/arch-arm/bionic/memcpy.S#L447

ARCH_ARM_NEON_MEMSET_DIVIDER should be NEON_MEMSET_DIVIDER
See https://github.com/SaberMod/android_bionic/blob/sm-jb-mr1/libc/arch-arm/bionic/memset.S#L136

ARCH_ARM_NEON_MEMCPY_ALIGNMENT_DIVIDER should be NEON_MEMCPY_ALIGNMENT_DIVIDER
See https://github.com/SaberMod/android_bionic/blob/sm-jb-mr1/libc/arch-arm/bionic/memcpy.S#L570

As stated in previous change mentioned above, ARCH_ARM_NEON_MEMCPY_ALIGNMENT_DIVIDER can not possibly cause a regression on cortex-a15 because it doesn't exsist in memcpy-a15.S of bionic.  NEON_MEMCPY_ALIGNMENT_DIVIDER also does not exsist for cortex-a15, so remove it.
Signed-off-by: Paul Beeler <sparksco@gmail.com>