clk: qcom: rcg2: Force enable the RCG before update for GFX

In the case where the RCG force_disabled and not
hw_prepared() or not hw_enabled() then force_enable
the RCG clock before updating the configuration and
force_disable it after configuration is updated.

Change-Id: I6e3d667815061b8574f76369219cad679f90f814
Signed-off-by: Chetan C R <cchinnad@codeaurora.org>