msm: fastcvpd: Fix multiple function definition issue

fastcvpd_video_suspend() is defined multiple times resulting
in compilation error if fastcvpd.h is included. Fix the error
by removing multiple definition in fastcvpd.h

Change-Id: I187aa8c0e346bac855e0c7e1360f15aefc8d2016
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>