msm: vidc: Update bit_depth in reconfig event

Firmware will trigger a reconfig event in case the bit depth
changes. This updated bit depth  must be passed on to the client.

CRs-Fixed: 2214018
Change-Id: I8e2e00d441a2cefade7e8929c4364366f75fef3c
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>