porting jpeg_mem_src() from jpeg lib v8c

A new function jpeg_mem_src() is ported from jpeg lib v8c to
support decode/encode in memory.  The source code is coming from
merged of Change-Id: I4d7f81fbb9a9e0cecaadd1855fc9f34296ba3eae
http://www.ijg.org/files/jpegsrc.v8c.tar.gz

Change-Id: I0a2cb95dba6819802e0e5209f450728f5f9acc19
VeNum optimizations

jpeg-VeNum-optimization-of-IDCT-YCbCr-to-RGB-color-c
Preserve registers D8-D15 when using VFP as specified by
AAPCS v2.03

Change-Id: I945a28392f68b12dc99bece0a0b9271f5d16e8f2

Conflicts:
	Android.mk
Update copyright to The Linux Foundation

Change-Id: I9f88c5b22d3df3fb2785b13b736bce45f51a3e9a