sm8450-common: Disable OMX

Bug: 222649162
Test: make
Change-Id: Iaf1046c610804c5bdb3b0f591e9907539534ea06

properties/vendor.prop

@@ -178,6 +178,7 @@ debug.c2.use_dmabufheaps=1
 debug.stagefright.c2inputsurface=-1
 debug.stagefright.ccodec=4
 debug.stagefright.omx_default_rank=0
+vendor.media.omx=0
 
 # Perf
 ro.vendor.extension_library=libqti-perfd-client.so