msm: camera: reqmgr: Reset sync link initial sync req

Reset sync link initial sync req when current link
enter non-sync mode as CRM has no chance to reset it
when sync link no req is applied, and hold the link
if sync link process request slowly.

Change-Id: I861fa6162bc97e830e6daed39c4e2903f2b91ba7
Signed-off-by: Depeng Shao <depengs@codeaurora.org>