MAINTAINERS: update NXP i.MX mail list address

Update NXP i.MX mail list address

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index ae82501..f86fdf9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -123,7 +123,7 @@
 ARM FREESCALE IMX
 M:	Stefano Babic <sbabic@denx.de>
 M:	Fabio Estevam <fabio.estevam@nxp.com>
-R:	NXP Linux Team <linux-imx@nxp.com>
+R:	NXP i.MX U-Boot Team <uboot-imx@nxp.com>
 S:	Maintained
 T:	git git://git.denx.de/u-boot-imx.git
 F:	arch/arm/cpu/arm1136/mx*/