arm: rmobile: Add HopeRun HiHope RZ/G2M board support

The HiHope RZ/G2M board from HopeRun consists of main board
(HopeRun HiHope RZ/G2M main board) and sub board(HopeRun
HiHope RZ/G2M sub board). The HiHope RZ/G2M sub board sits
below the HiHope RZ/G2M main board.

This patch adds the required board support to boot HopeRun HiHope
RZ/G2M board.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
diff --git a/board/hoperun/hihope-rzg2/Kconfig b/board/hoperun/hihope-rzg2/Kconfig
new file mode 100644
index 0000000..ee422ba
--- /dev/null
+++ b/board/hoperun/hihope-rzg2/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_HIHOPE_RZG2
+
+config SYS_SOC
+	default "rmobile"
+
+config SYS_BOARD
+	default "hihope-rzg2"
+
+config SYS_VENDOR
+	default "hoperun"
+
+config SYS_CONFIG_NAME
+	default "hihope-rzg2"
+
+endif