ARM: rmobile: beacon: Set CONFIG_RZ_G2 on Beacon boards

The board detection is incorrectly stating it's an rcar3 variant
instead of an RZ/G2 variant on all the r8a774*1_beacon boards.
Set the flag to correctly display as RZ/G2[M/N/H]

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/arch/arm/mach-rmobile/Kconfig.64 b/arch/arm/mach-rmobile/Kconfig.64
index 3f7ec05..c621f8a 100644
--- a/arch/arm/mach-rmobile/Kconfig.64
+++ b/arch/arm/mach-rmobile/Kconfig.64
@@ -69,16 +69,19 @@
 config TARGET_BEACON_RZG2H
 	bool "Beacon EmbeddedWorks RZ/G2H Dev Kit"
 	select R8A774E1
+	select RZ_G2
 	select PINCTRL_PFC_R8A774E1
 
 config TARGET_BEACON_RZG2M
 	bool "Beacon EmbeddedWorks RZ/G2M Dev Kit"
 	select R8A774A1
+	select RZ_G2
 	select PINCTRL_PFC_R8A774A1
 
 config TARGET_BEACON_RZG2N
 	bool "Beacon EmbeddedWorks RZ/G2N Dev Kit"
 	select R8A774B1
+	select RZ_G2
 	select PINCTRL_PFC_R8A774B1
 
 config TARGET_CONDOR