msm:ais: add sync multiclient create and reset extension

Add sync extension to create object with client id param that will
be offset of v4l2 event used. Also add reset API to enable reuse
of signalled sync objects.

Change-Id: I0d2297a57367b1cc81e48848de640df860078e70
Signed-off-by: Terence Ho <terenceh@codeaurora.org>