drm/msm/mdp5: introduce mdp5_hw_pipe

Split out the hardware pipe specifics from mdp5_plane.  To start, the hw
pipes are statically assigned to planes, but next step is to assign the
hw pipes during plane->atomic_check() based on requested caps (scaling,
YUV, etc).  And then hw pipe re-assignment if required if required SMP
blocks changes.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>

drivers/gpu/drm/msm/Makefile

@@ -37,6 +37,7 @@ msm-y := \
 	mdp/mdp5/mdp5_irq.o \
 	mdp/mdp5/mdp5_mdss.o \
 	mdp/mdp5/mdp5_kms.o \
+	mdp/mdp5/mdp5_pipe.o \
 	mdp/mdp5/mdp5_plane.o \
 	mdp/mdp5/mdp5_smp.o \
 	msm_atomic.o \