drm/msm/disp/dpu1: program 3d_merge only if block is attached

drm/msm/disp/dpu1: program 3d_merge only if block is attached

[ Upstream commit 12aca1ce9ee33af3751aec5e55a5900747cbdd4b ]

Update the 3d merge as active in the data path only if
the hw block is selected in the configuration.

Reported-by: Stephen Boyd <swboyd@chromium.org>
Fixes: 73bfb790ac78 ("msm:disp:dpu1: setup display datapath for SC7180 target")
Signed-off-by: Kalyan Thota <kalyan_t@codeaurora.org>
Message-Id: <1617364493-13518-1-git-send-email-kalyan_t@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>