Add new system APK locations.

Add /system/priv-app and /oem/app paths to system paths.  Also allow
rmdex on system apps, and quietly ignore when it was already removed.

Also relax logging when clearing code cache, since it's optional.

Bug: 17205122
Change-Id: I4fc4d0f63a3596937c4defbd64e1f8a1c563f02d
diff --git a/cmds/installd/installd.h b/cmds/installd/installd.h
index 99f037c..a5cad45 100644
--- a/cmds/installd/installd.h
+++ b/cmds/installd/installd.h
@@ -62,6 +62,7 @@
 #define CODE_CACHE_DIR_POSTFIX "/code_cache"
 
 #define APP_SUBDIR             "app/" // sub-directory under ANDROID_DATA
+#define PRIV_APP_SUBDIR        "priv-app/" // sub-directory under ANDROID_DATA
 
 #define APP_LIB_SUBDIR         "app-lib/" // sub-directory under ANDROID_DATA