msm: vidc: read capabilities as part of sys_init_done

Venus firmware now giving codec capabilities as part
of sys_init_done instead of session_init_done message
for all codecs. Parse capabilities in sys_init_done
and assign them to codecs indicated by venus firmware.
This change also maintains the backward compatibility
where firmware will send the capability as part of
session_init_done.

Change-Id: I4fd9943321808fa01aaaaea8edec3d08a57d9f0b
Signed-off-by: Vinay Kalia <vkalia@codeaurora.org>
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>