cfi_flash: Fix "Unknown FLASH" error message

When a CFI flash chip could not be detected an error message similar to
the following would be printed on bootup:

 FLASH: ## Unknown FLASH on Bank 1 - Size = 0x01000000 = 0 MB

The printf incorrectly converted the flash size into megabytes.  This
patch fixes the printing of the flash size in megabytes:

 FLASH: ## Unknown FLASH on Bank 1 - Size = 0x01000000 = 16 MB
Signed-off-by: NJohn Schmoller <jschmoller@xes-inc.com>
Signed-off-by: NPeter Tyser <ptyser@xes-inc.com>
Signed-off-by: NStefan Roese <sr@denx.de>

drivers/mtd/cfi_flash.c

@@ -2033,7 +2033,7 @@ unsigned long flash_init (void)
 			printf ("## Unknown FLASH on Bank %d "
 				"- Size = 0x%08lx = %ld MB\n",
 				i+1, flash_info[i].size,
-				flash_info[i].size << 20);
+				flash_info[i].size >> 20);
 #endif /* CONFIG_SYS_FLASH_QUIET_TEST */
 		}
 #ifdef CONFIG_SYS_FLASH_PROTECTION