msm: kgsl: Update current frequency in devfreq status structure

Current frequency was defaulted to min frequency. Which in turn prevents
bus dcvs to place the ib vote, due to a mismatch in current frequency
and devfreq recommended frequency.

Change-Id: Icda3669f2423369eeebfb0193d04de41c1f10b57
Signed-off-by: Mohammed Mirza Mandayappurath Manzoor <mmandaya@codeaurora.org>