clk: qcom: gpucc-sdm845: Add the skip_handoff flag to the gfx vdd class

Enabling and disabling the graphics rail as part of clock
registration and clock late init respectively causes issues
with the rail. Avoid doing so.

Change-Id: I14a79eb92abe654f2c3c0ae5b26cbcc522f22525
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>