Update 9.0 to r47 for 2019-08 sec patch

Author: phhusson

build.sh

@@ -14,7 +14,7 @@ aosp="android-8.1.0_r65"
 phh="android-8.1"
 
 if [ "$1" == "android-9.0" ];then
-    aosp="android-9.0.0_r45"
+    aosp="android-9.0.0_r47"
     phh="android-9.0"
 fi