[GLUtils] Return the correct pixel format for GL_SRGB8_ALPHA8.

The pixel format for GL_SRGB8_ALPHA8 should be GL_RGBA. Previously we added
support for explicitly passing in GL_SRGB8_ALPHA8 as internal format, in this
patch we make sure we pick the correct pixel format.

BUG: 117886297
Test: Build, flash and boot, test with hacked app
Change-Id: Ied6b7a649c9f64ba2afffd6627ebb0d14154d1f6
1 file changed