plat: renesas: rzg: 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>
Change-Id: I3ed55aa4a2cc5c9d9cd6440e087bcd93186520c7
diff --git a/plat/renesas/common/common.mk b/plat/renesas/common/common.mk
index cadb3d7..984ab5b 100644
--- a/plat/renesas/common/common.mk
+++ b/plat/renesas/common/common.mk
@@ -33,6 +33,7 @@
 RCAR_D3:=5
 RCAR_V3M:=6
 RCAR_AUTO:=99
+RZ_G2M:=100
 $(eval $(call add_define,RCAR_H3))
 $(eval $(call add_define,RCAR_M3))
 $(eval $(call add_define,RCAR_M3N))
@@ -41,6 +42,8 @@
 $(eval $(call add_define,RCAR_D3))
 $(eval $(call add_define,RCAR_V3M))
 $(eval $(call add_define,RCAR_AUTO))
+$(eval $(call add_define,RZ_G2M))
+
 RCAR_CUT_10:=0
 RCAR_CUT_11:=1
 RCAR_CUT_13:=3