Move "Mount /system" to the main menu.

Everyone's adding secret key combinations for this anyway, and it's
very useful when debugging.

Change-Id: Iad549452b872a7af963dd649f283ebcd3ea24234
diff --git a/ui.h b/ui.h
index 3b21774..bc728b0 100644
--- a/ui.h
+++ b/ui.h
@@ -81,7 +81,7 @@
     // Return value indicates whether an immediate operation should be
     // triggered (toggling the display, rebooting the device), or if
     // the key should be enqueued for use by the main thread.
-    enum KeyAction { ENQUEUE, TOGGLE, REBOOT, IGNORE, MOUNT_SYSTEM };
+    enum KeyAction { ENQUEUE, TOGGLE, REBOOT, IGNORE };
     virtual KeyAction CheckKey(int key);
 
     // Called immediately before each call to CheckKey(), tell you if
@@ -134,7 +134,6 @@
     int rel_sum;
 
     int consecutive_power_keys;
-    int consecutive_alternate_keys;
     int last_key;
 
     typedef struct {