drm/msm/sde: fix the possible memory leak in driver catalog

Memory allocated for safe signals LUT's is not freed in the
catalog deinitialization, which can cause memory leak
if the display driver is uninstalled dynamically.

Change-Id: I5bdd96034dc99d2abfcb0a562d11837858aeb44e
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>