Attempt to automatically identify data/media devices

Change-Id: Ia3007fbced9ce3bc94efdb3dacc582a5e68a49a4
diff --git a/twrp.cpp b/twrp.cpp
index d9a5ab1..7361396 100644
--- a/twrp.cpp
+++ b/twrp.cpp
@@ -51,6 +51,7 @@
 
 TWPartitionManager PartitionManager;
 int Log_Offset;
+bool datamedia;
 twrpDU du;
 
 static void Print_Prop(const char *key, const char *name, void *cookie) {
@@ -76,6 +77,10 @@
 		return 0;
 	}
 
+#ifdef RECOVERY_SDCARD_ON_DATA
+	datamedia = true;
+#endif
+
 	char crash_prop_val[PROPERTY_VALUE_MAX];
 	int crash_counter;
 	property_get("twrp.crash_counter", crash_prop_val, "-1");