Android: Show SD root path in Riivolution activity

Source/Android/app/src/main/res/values/strings.xml

@@ -482,6 +482,7 @@ It can efficiently compress both junk data and encrypted Wii data.
     </string>
 
     <!-- Riivolution Boot Screen -->
+    <string name="riivolution_sd_root">SD Root: %1$s</string>
     <string name="riivolution_disabled">Disabled</string>
     <string name="riivolution_start">Start</string>