[app/aboot]: Add additional key for fastboot mode.

This key is needed for FLUID device to boot into fastboot mode.
FLUID device will not have keypad.
diff --git a/app/aboot/aboot.c b/app/aboot/aboot.c
index 0060306..3c894dc 100755
--- a/app/aboot/aboot.c
+++ b/app/aboot/aboot.c
@@ -389,6 +389,8 @@
 	        boot_into_recovery = 1;
 	if (keys_get_state(KEY_BACK) != 0)
 		goto fastboot;
+	if (keys_get_state(KEY_CLEAR) != 0)
+		goto fastboot;
 
 	reboot_mode = check_reboot_mode();
         if (reboot_mode == RECOVERY_MODE){