clk: qcom: gcc-sm8650: Do not turn off USB GDSCs during gdsc_disable()

With PWRSTS_OFF_ON, USB GDSCs are turned off during gdsc_disable(). This
can happen during scenarios such as system suspend and breaks the resume
of USB controller from suspend.

So use PWRSTS_RET_ON to indicate the GDSC driver to not turn off the GDSCs
during gdsc_disable() and allow the hardware to transition the GDSCs to
retention when the parent domain enters low power state during system
suspend.

Fixes: c58225b7 ("clk: qcom: add the SM8650 Global Clock Controller driver, part 1")
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>