MAINTAINERS/mailmap: Update my email address

Update my email address to the NXP account.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/board/freescale/mx53smd/MAINTAINERS b/board/freescale/mx53smd/MAINTAINERS
index 8830321..17ec376 100644
--- a/board/freescale/mx53smd/MAINTAINERS
+++ b/board/freescale/mx53smd/MAINTAINERS
@@ -1,5 +1,5 @@
 MX53SMD BOARD
-M:	Fabio Estevam <fabio.estevam@freescale.com>
+M:	Fabio Estevam <fabio.estevam@nxp.com>
 S:	Maintained
 F:	board/freescale/mx53smd/
 F:	include/configs/mx53smd.h