ARM: dts: msm: Add GCC and MMSS GDSCs for MSMCOBALT

Add the GDSC devices for all GCC GDSCs, except the votable GDSCs and
most MMSS GDSCs. Keep using the dummy GDSC devices for the remaining
ones since the current simulation builds do not model them.

Also add support for dummy gpu clock controller.

Change-Id: I81f215b95f6ad16eda99834817eed0d090415a7d
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>