Use a mini version of libskia in renderengine

Bug: 167743764
Test: ls -lh surfaceflinger

With this change, surfaceflinger is 6.0M, down from 7.4M.

Depends on https://skia-review.googlesource.com/c/skia/+/402257

Change-Id: I4161315901a8ea55ae4851eb09508bf28795b551