clk: ti: dra7xx: fix gpu clkctrl parent

gpu_cm:* parent clock name is wrong, replace this with correct
gpu-clkctrl:* clock. Otherwise the clock ends up in the orphaned list.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Link: https://lkml.kernel.org/r/20200430083640.8621-2-t-kristo@ti.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>