msm: Add cpp in msm8994 device tree and defconfig

CPP driver has to be enabled in device tree in order to be
probed. The clocks shoud be specified also, and it has to
be enabled in defconfig.

Change-Id: I40c13eb98d33855657412566ab8b4bb9ba07ef8f
Signed-off-by: Iliya Varadzhakov <ivarad@codeaurora.org>
Signed-off-by: Rajakumar Govindaram <rajakuma@codeaurora.org>