Revert "msm: vidc: Don't free OCMEM when there is an open video instance"

This reverts commit 3f4a62c5443de1e3a649c56fe2612b68cbdcb77c.
msm: vidc: Add instance to instance list prior to CORE_INIT.
During CORE_INIT, driver votes for bus only if core->instances list
is not empty. Since the current video instance is added to core->instances
list after core init, driver fails to vote for bus. This causes ion_map to
hang and resets the device.

Conflicts:
	drivers/media/platform/msm/vidc/msm_vidc.c

Change-Id: Ia68a953572852db63737f30998cf10c5db151292
Signed-off-by: Srinu Gorle <sgorle@codeaurora.org>
Signed-off-by: Bhasker Komateddy <bkomat@codeaurora.org>