EMMC support in applypatch

Let applypatch read and write EMMC partitions as well as MTD ones.
This enables incremental updates that include boot image changes, as
well as OTA of new recovery partitions.

Change-Id: I3766b9e77c639769ddf693b675da51d57f6e6b1d
diff --git a/ui.c b/ui.c
index 3bb2c2a..ee6a0c5 100644
--- a/ui.c
+++ b/ui.c
@@ -29,7 +29,7 @@
 #include "minui/minui.h"
 #include "recovery_ui.h"
 
-#define MAX_COLS 64
+#define MAX_COLS 96
 #define MAX_ROWS 32
 
 #define CHAR_WIDTH 10