skia: compile SkTextBox for Samsung's libtvout

Change-Id: Ic1fdddbe8c5c41ff2bf7c1b723d054e509a64185
skia: add compat SkBitmap::setConfig symbol

Required for older Samsung libtvout

Change-Id: Icaae6ca01556553e57c3a194427093c59e0c5f65