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/doc/README.rmobile b/doc/README.rmobile
index f1bca54..ea170a2 100644
--- a/doc/README.rmobile
+++ b/doc/README.rmobile
@@ -32,6 +32,7 @@
 | R8A7796  M3-W | Renesas Electronics ULCB               | r8a7796_ulcb
 |---------------+----------------------------------------+-------------------
 | R8A77965 M3-N | Renesas Electronics Salvator-XS        | r8a77965_salvator-x_defconfig
+| R8A77965 M3-N | Renesas Electronics ULCB               | r8a77965_ulcb
 |---------------+----------------------------------------+-------------------
 | R8A77970 V3M  | Renesas Electronics Eagle              | r8a77970_eagle_defconfig
 |---------------+----------------------------------------+-------------------