Update Paul Burton's email address

MIPS is no longer a part of Imagination Technologies, and as such my
@imgtec.com email address will soon cease to function. This patch
updates occurrances of it with my new @mips.com email address, and adds
an entry in .mailmap such that git (& tools such as get_maintainer.pl
when examining history) will use the new address.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: u-boot@lists.denx.de

.mailmap

@@ -20,6 +20,7 @@ Jagan Teki <jaganna@xilinx.com>
 Jagan Teki <jagannadh.teki@gmail.com>
 Jagan Teki <jagannadha.sutradharudu-teki@xilinx.com>
 Markus Klotzbuecher <mk@denx.de>
+Paul Burton <paul.burton@mips.com> <paul.burton@imgtec.com>
 Prabhakar Kushwaha <prabhakar@freescale.com>
 Rajeshwari Shinde <rajeshwari.s@samsung.com>
 Ricardo Ribalda <ricardo.ribalda@uam.es>

board/imgtec/boston/MAINTAINERS

 BOSTON BOARD
-M:	Paul Burton <paul.burton@imgtec.com>
+M:	Paul Burton <paul.burton@mips.com>
 S:	Maintained
 F:	board/imgtec/boston/
 F:	include/configs/boston.h

board/imgtec/malta/MAINTAINERS

 MALTA BOARD
-M:	Paul Burton <paul.burton@imgtec.com>
+M:	Paul Burton <paul.burton@mips.com>
 S:	Maintained
 F:	board/imgtec/malta/
 F:	include/configs/malta.h

board/imgtec/malta/superio.c

 /*
  * Copyright (C) 2013 Imagination Technologies
- * Author: Paul Burton <paul.burton@imgtec.com>
+ * Author: Paul Burton <paul.burton@mips.com>
  *
  * Setup code for the FDC37M817 super I/O controller
  *

board/imgtec/malta/superio.h

 /*
  * Copyright (C) 2013 Imagination Technologies
- * Author: Paul Burton <paul.burton@imgtec.com>
+ * Author: Paul Burton <paul.burton@mips.com>
  *
  * Setup code for the FDC37M817 super I/O controller
  *

drivers/pci/pci_msc01.c

 /*
  * Copyright (C) 2013 Imagination Technologies
- * Author: Paul Burton <paul.burton@imgtec.com>
+ * Author: Paul Burton <paul.burton@mips.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

include/msc01.h

 /*
  * Copyright (C) 2013 Imagination Technologies
- * Author: Paul Burton <paul.burton@imgtec.com>
+ * Author: Paul Burton <paul.burton@mips.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

include/pci_msc01.h

 /*
  * Copyright (C) 2013 Imagination Technologies
- * Author: Paul Burton <paul.burton@imgtec.com>
+ * Author: Paul Burton <paul.burton@mips.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */