msm: vidc: Update extradata control API

Introduce an instance variable to cache extradata control values set
by client. Clients can set single or multiple extradata controls
and this variable caches the set controls.

CRs-Fixed: 2384822
Change-Id: I1457d8a6e18aaed4c776b687ba65c449ababfa11
Signed-off-by: Mihir Ganu <mganu@codeaurora.org>