MAINTAINERS: Switch nxp.com domain

freescale.com domain is no longer reachable, so switch the
maintainers' emails to nxp.com domain instead.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 9f653a0..60d4adf 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -307,7 +307,7 @@
 F:	drivers/mtd/jedec_flash.c
 
 COLDFIRE
-M:	Huan Wang <alison.wang@freescale.com>
+M:	Huan Wang <alison.wang@nxp.com>
 M:	Angelo Dureghello <angelo@sysam.it>
 S:	Maintained
 T:	git git://git.denx.de/u-boot-coldfire.git