drm/msm: separate connector set_info_blob from post_init

Connector performs post initialization to install connector
specific properties and info blob. However, this is also
used to refresh info blob during atomic check, resulting
in re-registration of connector properties. Separate
current info blob refresh from post initialization so that
connector properties are registered only once during
initialization.

Change-Id: Iae0ff05884a28148251d907cdf81cd34a7ebcd61
Signed-off-by: Alan Kwong <akwong@codeaurora.org>