Remove debug.gr.numframebuffers

Change-Id: I7de94fc1970fc650ae688963723d5a3b0d247550
Enable OpenGL ES 3.0 support and disable render dirty regions

 * Render dirty regions are buggy on this device in 4.3,
   and causes weird graphical artifacts.

Change-Id: I2c4e735d3621a2c3a8325188461314e41f496c3e