clk: qcom: Add graphics clock driver for TRINKET

Add support for the graphics clock controller found on
TRINKET based devices. This allows graphics device
drivers to probe and control their clocks.

Change-Id: I66bbf2377f3cdc85ac8748537553bc7fb21938b8
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>