Up A11 to r48

Author: phhusson

build.sh

@@ -26,7 +26,7 @@ elif [ "$1" == "android-10.0" ];then
     phh="android-10.0"
 elif [ "$1" == "android-11.0" ];then
     manifest_url="https://android.googlesource.com/platform/manifest"
-    aosp="android-11.0.0_r45"
+    aosp="android-11.0.0_r48"
     phh="android-11.0"
 else
 	# guess android version from version number