Bug 869696 - Add AdrenoTM205 to renderer enum. r=bjacob

Add the 'Adreno (TM) 205' renderer string to the renderer enum in GLContext.
Bug 869696 - Use an alternative method to unlock gralloc textures on Adreno (TM) 205. r=bjacob

Targeting the NULL EGLImage causes slowness on the Geeksphone Peak,
and assumedly, other "Adreno (TM) 205" devices. Achieve the same
effect by deleting the GL texture instead.