Swap no_os and missing_os screen to reflect the previous change.

Previous change http://gerrit.chromium.org/gerrit/#change,419 swaped the order
in the prebuilt GBB. This change reflects it in u-boot.

BUG=none
TEST=build u-boot-next, boot it to recovery firmware, and see the proper screens

Change-Id: Ic921c72903eab647f2601ee38a3897f9b2230361
Reviewed-on: http://gerrit.chromium.org/gerrit/755
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
diff --git a/common/cmd_cros_rec.c b/common/cmd_cros_rec.c
index bf23b26..545110d 100644
--- a/common/cmd_cros_rec.c
+++ b/common/cmd_cros_rec.c
@@ -432,7 +432,7 @@
 				is_usb = is_usb_storage_present();
 			}
 			if (!is_mmc && !is_usb) {
-				show_screen(SCREEN_RECOVERY_NO_OS);
+				show_screen(SCREEN_RECOVERY_MISSING_OS);
 				wait_ms(WAIT_MS_BETWEEN_PROBING);
 			}
 		} while (!is_mmc && !is_usb);
@@ -443,14 +443,14 @@
 			WARN_ON_FAILURE(boot_recovery_image_in_mmc());
 			/* Wait for user to unplug SD card */
 			do {
-				show_screen(SCREEN_RECOVERY_MISSING_OS);
+				show_screen(SCREEN_RECOVERY_NO_OS);
 				wait_ms(WAIT_MS_SHOW_ERROR);
 			} while (is_mmc_storage_present());
 		} else if (is_usb) {
 			WARN_ON_FAILURE(boot_recovery_image_in_usb());
 			/* Wait for user to unplug USB storage device */
 			do {
-				show_screen(SCREEN_RECOVERY_MISSING_OS);
+				show_screen(SCREEN_RECOVERY_NO_OS);
 				wait_ms(WAIT_MS_SHOW_ERROR);
 			} while (is_usb_storage_present());
 		}