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/mx6slevk/MAINTAINERS b/board/freescale/mx6slevk/MAINTAINERS
index f4e74ba..2e25433 100644
--- a/board/freescale/mx6slevk/MAINTAINERS
+++ b/board/freescale/mx6slevk/MAINTAINERS
@@ -1,5 +1,5 @@
 MX6SLEVK BOARD
-M:	Fabio Estevam <fabio.estevam@freescale.com>
+M:	Fabio Estevam <fabio.estevam@nxp.com>
 M:	Peng Fan <Peng.Fan@freescale.com>
 S:	Maintained
 F:	board/freescale/mx6slevk/