gpu_cc_cx_gdsc is hw-ctrl-addr status polled and hw-ctrl-addr
register PWR_UP/DOWN status bit does not match.
Hence remove cfg-gdscr property and poll for GDS_HW_CTRL PWR_ON
status for gpu_cc_cx_gdsc as earlier.
Change-Id: I1e6bff4a9c747b1fa423ca626f2901ef1c49e32e