ARM: rmobile: Add R8A77965 Salvator-XS board support

Add R8A77965 M3N Salvator-XS development kit support. This kit is
similar to the other Salvator-X(S) ones, except is has M3N SoC on
it.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/renesas/salvator-x/MAINTAINERS b/board/renesas/salvator-x/MAINTAINERS
index f7b98fb..542f7cc 100644
--- a/board/renesas/salvator-x/MAINTAINERS
+++ b/board/renesas/salvator-x/MAINTAINERS
@@ -5,3 +5,4 @@
 F:	include/configs/salvator-x.h
 F:	configs/r8a7795_salvator-x_defconfig
 F:	configs/r8a7796_salvator-x_defconfig
+F:	configs/r8a77965_salvator-x_defconfig