DEVELOPERS: Add some i.MX boards to my name

I would like to help maintaining the following defconfigs:

imx23evk_defconfig
imx6-sabreauto_defconfig
imx7dpico_defconfig
mx25pdk_defconfig
mx51evk_defconfig
mx53loco_defconfig

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -603,11 +603,16 @@ F:	package/supertuxkart/
 N:	Fabio Estevam <festevam@gmail.com>
 F:	board/warp7/
 F:	configs/freescale_imx*
-F:	configs/imx6-sabresd*
+F:	configs/imx23evk_defconfig
+F:	configs/imx6-sabre*
 F:	configs/imx6slevk_defconfig
 F:	configs/imx6sx-sdb_defconfig
 F:	configs/imx6ulevk_defconfig
 F:	configs/imx6ulpico_defconfig
+F:	configs/imx7dpico_defconfig
+F:	configs/mx25pdk_defconfig
+F:	configs/mx51evk_defconfig
+F:	configs/mx53loco_defconfig
 F:	configs/mx6cubox_defconfig
 F:	configs/mx6sx_udoo_neo_defconfig
 F:	configs/mx6udoo_defconfig