drm: msm: sde: reorder call sequence in splash release thread

When splash releases resource, kernel blob property should
be updated at first, and then uevent sending follows.
This sequence can ensure user can always get the correct
information after kernel blob property is updated in
splash handoff thread.

Change-Id: I7b6493943c6eb1624da75dff5252dd3a71dea657
Signed-off-by: Guchun Chen <guchunc@codeaurora.org>