dt-bindings: clock: Add support for GCC clock ids for SDM429W

Add clock IDs for GCC for clients to be able to request
for clocks from clock controller for SDM429W.

Change-Id: I80dd87b60fcaf8f776beb9a5b05b95204319df07
Signed-off-by: Saurabh Sahu <sausah@codeaurora.org>