sm8450-common: Set ro.media.xml_variant.profiles to choose media profiles

This was introduced with [1] and allows to choose target specific media
profiles without caf changes to frameworks/av. Unset media.settings.xml
so that the new property gets respected.

[1]: eaac82f33f#

Change-Id: I7ec306bf3dd595c09308ed26c9d3a6db8490c7f0

properties/system.prop

@@ -6,7 +6,6 @@ debug.sf.disable_backpressure=1
 
 # Media
 media.aac_51_output_enabled=true
-media.settings.xml=/vendor/etc/media_profiles_vendor.xml
 media.stagefright.enable-aac=true
 media.stagefright.enable-fma2dp=true
 media.stagefright.enable-http=true