imx: fix missing MAINTAINERS pico boards

Add missing files pico-nymph-imx7d_defconfig and
c>onfigs/pico-dwarf-imx7d_defconfig

Signed-off-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
CC: Fabio Estevam <festevam@gmail.com>
CC: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/board/technexion/pico-imx7d/MAINTAINERS b/board/technexion/pico-imx7d/MAINTAINERS
index 6e7316b..325e173 100644
--- a/board/technexion/pico-imx7d/MAINTAINERS
+++ b/board/technexion/pico-imx7d/MAINTAINERS
@@ -8,3 +8,5 @@
 F:	configs/pico-imx7d_bl33_defconfig
 F:	configs/pico-hobbit-imx7d_defconfig
 F:	configs/pico-pi-imx7d_defconfig
+F:	configs/pico-nymph-imx7d_defconfig
+F:	configs/pico-dwarf-imx7d_defconfig