mx6memcal: fix comment in board header file

The board header file included a reference to the starting point
from nitrogen6x.h, but since so much changed, the file bears
little resemblance to that file.
Signed-off-by: NEric Nelson <eric@nelint.com>

include/configs/mx6memcal.h

 /*
- * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
+ * Copyright (C) 2010-2018 Freescale Semiconductor, Inc.
  *
- * Configuration settings for the Boundary Devices Nitrogen6X
- * and Freescale i.MX6Q Sabre Lite boards.
+ * Configuration settings for the virtual mx6memcal board.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */