msm: vidc: Add missing support for msm_vidc kernel client's

Add APIs onto kernel symbol table for LKM access including smem's
and add new API to get a pointer to the platform resources
which is needed by one of the smem APIs.

Change-Id: Ia40499e047bdd0bec142d126824564dfe9d863c3
Signed-off-by: Jorge Solano Altamirano <jsolano@codeaurora.org>