sm8250-common: Set persist.sys.sf.color_mode to DISPLAY_COLOR_MANAGED (0)

* 'Display white balance' only works when color_mode is
  set to something other than the default value
  DISPLAY_COLOR_UNMANAGED (1).

Change-Id: Idaf30a2f2924c461fc0f034f099afaecb5bbf79b

vendor.prop

@@ -4,6 +4,7 @@ aaudio.mmap_exclusive_policy=2
 aaudio.mmap_policy=2
 audio.deep_buffer.media=true
 audio.offload.video=false
+persist.sys.sf.color_mode=0
 persist.vendor.audio.ambisonic.auto.profile=false
 persist.vendor.audio.ambisonic.capture=false
 persist.vendor.audio.apptype.multirec.enabled=false