igep00x0: Remove IGEP0020_NAND BOARD entry from MAINTAINERS

Boards with NAND and OneNAND are supported by single configuration,
thus remove now obsolete IGEP0020_NAND BOARD entry.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
diff --git a/board/isee/igep00x0/MAINTAINERS b/board/isee/igep00x0/MAINTAINERS
index d355c46..720ef2a 100644
--- a/board/isee/igep00x0/MAINTAINERS
+++ b/board/isee/igep00x0/MAINTAINERS
@@ -6,9 +6,3 @@
 F:	configs/igep0020_defconfig
 F:	configs/igep0030_defconfig
 F:	configs/igep0032_defconfig
-
-IGEP0020_NAND BOARD
-#M:	-
-S:	Maintained
-F:	configs/igep0020_nand_defconfig
-F:	configs/igep0030_nand_defconfig