ARM: dts: msm: Add clocks, bus vote & regulator to ICE for msm8996

New ICE hardware requires power regulators, clocks, bus vote to be
enabled and set properly before key registers can be read/written.
Earlier, caller was explicitly doing this job. Now, it is becoming
complex and hence moving all ICE setup related functionalities to
ICE driver.

Change-Id: I8375ef667eb5f231c2b308f0f82a9cf413c32354
Signed-off-by: Dinesh K Garg <dineshg@codeaurora.org>