drm/msm: carve out KMS code from msm_drv.c

The msm_drv.c contains generic code intermixed with KMS handling code.
Move all KMS-related code to a separate msm_kms.c file, cleaning up init
code while doing this move. This also prevents msm driver from registering
modesetting / atomic interfaces in the headless case.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/561648/
Signed-off-by: Rob Clark <robdclark@chromium.org>

Author: lumag

drivers/gpu/drm/msm/Makefile

@@ -106,6 +106,7 @@ msm-y += \
 	msm_gpu_devfreq.o \
 	msm_io_utils.o \
 	msm_iommu.o \
+	msm_kms.o \
 	msm_perf.o \
 	msm_rd.o \
 	msm_ringbuffer.o \