board: freescale: Add entry for imx8mm_evk_fspi_defconfig

Add entry for imx8mm_evk_fspi_defconfig in
board/freescale/imx8mm_evk/MAINTAINERS

Signed-off-by: Mamta Shukla <mamta.shukla@leica-geosystems.com>
Signed-off-by: Thomas Haemmerle <thomas.haemmerle@leica-geosystems.com>
Tested-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
1 file changed