ARM: rmobile: Add R8A77965 M3NULCB support

Add defconfig and board specific adjustments for the R8A77965 M3N ULCB.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/renesas/ulcb/MAINTAINERS b/board/renesas/ulcb/MAINTAINERS
index e7cdc52..8549f54 100644
--- a/board/renesas/ulcb/MAINTAINERS
+++ b/board/renesas/ulcb/MAINTAINERS
@@ -5,3 +5,4 @@
 F:	include/configs/ulcb.h
 F:	configs/r8a7795_ulcb_defconfig
 F:	configs/r8a7796_ulcb_defconfig
+F:	configs/r8a77965_ulcb_defconfig