Mark gpucc clock node as GenPD provider and disable the
graphics GDSC regulator nodes. While at it, update gxclkctl
node to add support for gx_clkctl_gx_gdsc power domain.
Change-Id: I0d4c84da2e3aadd7e1a901d6a9e26c7d4ad1a3c1
Signed-off-by: Jagadeesh Kona <quic_jkona@quicinc.com>