libc: Enable high-performance memmove and bcopy for cortex-a15

Change-Id: Id8e4e595021dd13bf4ab5620f5fb0b0d80333616
Merge remote-tracking branch 'cm/cm-11.0' into HEAD

Change-Id: Ie45bfb416756cb42c5bd7ed22c7c9579e2a17ba9