arm: renesas: Add config option for R8A774B1 SoC

Add config support for RZ/G2N(a.k.a R8A774B1) SoC.

Also fixed the alignment issue on R8A774A1 config.
Signed-off-by: NBiju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: NLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

arch/arm/mach-rmobile/Kconfig.64

@@ -3,7 +3,10 @@ if RCAR_GEN3
 menu "Select Target SoC"
 
 config R8A774A1
-        bool "Renesas SoC R8A774A1"
+	bool "Renesas SoC R8A774A1"
+
+config R8A774B1
+	bool "Renesas SoC R8A774B1"
 
 config R8A7795
 	bool "Renesas SoC R8A7795"