i.MX6: engicam: Fix MAINTAINERS/README

- Update newly added include/configs file in MAINTAINERS
- Update newly added defconfig file in README

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/board/engicam/isiotmx6ul/MAINTAINERS b/board/engicam/isiotmx6ul/MAINTAINERS
index c30cfe7..9b66c8d 100644
--- a/board/engicam/isiotmx6ul/MAINTAINERS
+++ b/board/engicam/isiotmx6ul/MAINTAINERS
@@ -2,7 +2,7 @@
 M:	Jagan Teki <jagan@amarulasolutions.com>
 S:	Maintained
 F:	board/engicam/isiotmx6ul
-F:	include/configs/imx6ul_isiot.h
+F:	include/configs/imx6-engicam.h
 F:	configs/imx6ul_isiot_mmc_defconfig
 F:	configs/imx6ul_isiot_emmc_defconfig
 F:	configs/imx6ul_isiot_nand_defconfig