devfreq: update target frequency in cdspl3 governor start

Trigger an update devfreq to reflect the desired target frequency
when cdspl3 governor is selected for a device. This is to avoid
running with a target frequency set by a different governor before
 cdspl3 governor gets L3 frequency request from CDSP.

Change-Id: Id5bf006d9d0584c7df93b01e47f4ccc5167fe8aa
Acked-by: Sreekanth Gande <sgande@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>