MAINTAINERS: Update some entries for missed boards

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/seeed/linkit-smart-7688/MAINTAINERS b/board/seeed/linkit-smart-7688/MAINTAINERS
index c3bbad4..f2186c1 100644
--- a/board/seeed/linkit-smart-7688/MAINTAINERS
+++ b/board/seeed/linkit-smart-7688/MAINTAINERS
@@ -4,5 +4,5 @@
 F:	board/seeed/linkit-smart-7688
 F:	include/configs/linkit-smart-7688.h
 F:	configs/linkit-smart-7688_defconfig
-F:	configs/linkit-smart-7688_ram_defconfig
+F:	configs/linkit-smart-7688-ram_defconfig
 F:	arch/mips/dts/linkit-smart-7688.dts