clk: qcom: gpucc: Remove support for RBCPR clock for LITO

GPUCC clocks are not used by clients, so remove support for the same.
While at it do not poll for CLK_OFF for the gcc gpu clocks during disable.

Change-Id: I12d539f8b72ebeed4c8ef73f90a43dbb9d6fadc9
Signed-off-by: Taniya Das <tdas@codeaurora.org>