msm: kgsl: Add intermediate power levels

Make use of the two independent power domains to
add intermediate levels.  Attempt to just increase
the bus frequency before also raising the GPU
frequency.

Change-Id: Ie2109df001f96e36e03959288aa957d63c0ef4a7
Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>

Conflicts:
	arch/arm/mach-msm/include/mach/kgsl.h
	drivers/gpu/msm/kgsl_pwrctrl.c
	drivers/gpu/msm/kgsl_pwrctrl.h
	drivers/gpu/msm/kgsl_pwrscale_trustzone.c