msm: We are using the msm2 gpu driver

Fix references that are incorrectly pointing at drivers/gpu/msm
instead of msm2.

This breaks kernels build with higher optimization levels and
not fixing it will likely bite us in the future in some other
mysterious way.

Change-Id: I3c51062ca6a66ddb9782365d2c51c5e485556c1b

Conflicts:
	drivers/gpu/msm2/Makefile