reintroduce use of e_pow.S
libc: Add ARMV7 optimized memchr()

 * From Cortex-Strings via Linaro
 * Performance is 10x over the default version on microbenchmarks

Change-Id: I14c1b5ccbd0078219a1dbf9f02fb1591b3a2403c

Conflicts:
	libc/Android.mk
Bionic/libm: Fix the mismatch ENTRY/END in e_pow.S

Change-Id: Ibe53e7863f462a63029d1154f317256c00814c6d
msm: vidc: Add the support for MPEG-2 extension and user data

Update msm vidc header to match the new qcom/media branch

Change-Id: I444982ba7fb77f1ff3b71f4f09a4c436ff966859
Fix memchr() from my derpy merge