msm: copper: add device nodes and clock information for mdss

Copper uses Mobile Display SubSystem, add device tree and clock
information to be used in mdss driver.

Change-Id: I67397a28168407b3268f4f026f35d69a04062995
Signed-off-by: Nagamalleswararao Ganji <nganji@codeaurora.org>
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>