MAINTAINERS: Update some entries for missed boards

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/atmel/sama5d27_som1_ek/MAINTAINERS b/board/atmel/sama5d27_som1_ek/MAINTAINERS
index 609583c..295639c 100644
--- a/board/atmel/sama5d27_som1_ek/MAINTAINERS
+++ b/board/atmel/sama5d27_som1_ek/MAINTAINERS
@@ -4,3 +4,4 @@
 F:	board/atmel/sama5d27_som1_ek/
 F:	include/configs/sama5d27_som1_ek.h
 F:	configs/sama5d27_som1_ek_mmc_defconfig
+F:	configs/sama5d27_som1_ek_mmc1_defconfig