ARM: dts: msm: fix mdss & dsi dt settings for msm8937

Remove unsupported blocks and add required blocks in
MDSS and DSI DT nodes for msm8937.

Change-Id: If00244dc3fdfd14c11dbaf4c2c65380d526f2a9f
Signed-off-by: Krishna Chaitanya Devarakonda <kdevarak@codeaurora.org>