disp: msm: sde: update input fence after plane state destroy

In few cases, even though input fence is freed, it might
get accessed through debugfs node. This change updates
input fence in plane state destroy to prevent accessing
it.

Change-Id: I1a3799249e6a177af87653e17d014d1dad7ca638
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>