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: Ic614a19fd3b9ca5804605b8c7627086918207dac
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>