Remove use of internal Skia jpeg struct

Copied (and slightly simplified) from [1] and [2].

I think this was the last direct use of things in the
Skia-internal folder src/images, so I removed that from
HWUI's search path to avoid regressions.

[1] https://github.com/google/skia/blob/7b3fb04bc3d4615ed90cf45fe32ccd03d2b5b0dd/src/images/SkJPEGWriteUtility.h#L32
[2] https://github.com/google/skia/blob/7b3fb04bc3d4615ed90cf45fe32ccd03d2b5b0dd/src/images/SkJPEGWriteUtility.cpp#L69

Change-Id: Ic1ee3c0185910f377c37c79b30f37f41c53da3f2
Bug: skbug.com/13983