gta4xl: Move audio mixer configs to devicetree

* Move mixer_gains.xml to common devicetree
* Also move floating_feature.xml to the correct section

Change-Id: Ia3188800121111e48f62025e51c23241f324e466
diff --git a/proprietary-files.txt b/proprietary-files.txt
index 43df375..9e5ee58 100644
--- a/proprietary-files.txt
+++ b/proprietary-files.txt
@@ -1,9 +1,5 @@
 # Proprietary files - from Samsung package version P615XXS5FWD2, unless pinned
 
-## Audio
-vendor/etc/floating_feature.xml
-vendor/etc/mixer_gains.xml
-
 ## Audio - Dolby Atmos
 -vendor/lib/soundfx/libswdap.so
 
@@ -36,6 +32,7 @@
 -vendor/bin/cbd
 vendor/etc/init/init.baseband.rc
 vendor/etc/init/init.vendor.rilcommon.rc
+vendor/etc/floating_feature.xml
 vendor/etc/plmn_delta.bin
 vendor/etc/plmn_delta_attaio.bin
 vendor/etc/plmn_delta_hktw.bin