recovery: Autodetection of device flash type

Detect flash type at runtime rather than requiring this to be set in the
device configuration. The detection is based on the existence of /proc/mtd,
/proc/emmc, or /dev/block/bml1.

Change-Id: I464962a567022c5862c249f06d36c2d1cddeacba
diff --git a/roots.h b/roots.h
index e10663d..02ec2fb 100644
--- a/roots.h
+++ b/roots.h
@@ -19,6 +19,7 @@
 #define RECOVERY_ROOTS_H_
 
 #include "minzip/Zip.h"
+#include "flashutils/flashutils.h"
 #include "mtdutils/mtdutils.h"
 #include "mmcutils/mmcutils.h"