Override has_boot_sounds for Marlin (and sailfish)

Allows boot sounds to be enabled/disabled in Settings.

BUG:30888962
Change-Id: I4511bb7d0850383fa620656aff7ac15a7a12852e
diff --git a/overlay/packages/apps/Settings/res/values/bools.xml b/overlay/packages/apps/Settings/res/values/bools.xml
index 3252918..5c62bb8 100755
--- a/overlay/packages/apps/Settings/res/values/bools.xml
+++ b/overlay/packages/apps/Settings/res/values/bools.xml
@@ -15,6 +15,8 @@
 -->
 
 <resources>
+    <!-- Whether there is a boot sounds checkbox -->
+    <bool name="has_boot_sounds">true</bool>
     <!-- Whether to show a preference item for mobile plan -->
     <bool name="config_show_mobile_plan">false</bool>
     <!-- Whether to show a preference item for regulatory information in About phone -->