drm/msm/adreno: push dump/show stuff to base class

Add ptr to list of interesting registers to 'struct adreno_gpu' and use
that to move most of the debugfs show and register dump bits down into
adreno_gpu.  This will avoid duplication as support for additional
adreno generations is added.

Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --cc drivers/gpu/drm/msm/adreno/a3xx_gpu.c
Simple merge

diff --cc drivers/gpu/drm/msm/adreno/adreno_gpu.c
Simple merge

diff --cc drivers/gpu/drm/msm/adreno/adreno_gpu.h
Simple merge