Remove the usage of GL_TEXTURE_PROTECTED_EXT.

Per spec
https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_protected_textures.txt,
In order to take effect, the texture usage must be specified before the texture
contents are defined by TexStorage*, we never use TexStorage*, thus this
extension is unnecessary.

BUG: 131782912
Test: Build, flash. Verified with protected content.
Change-Id: I69c8583274bc3cd10b4e8777813dd4170014750c