arm64: defconfig: enable R8A774C0 SoC

Enable the Renesas RZ/G2E (R8A774C0) SoC in the ARM64 defconfig.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Biju Das <biju.das@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/configs/defconfig

@@ -50,6 +50,7 @@ CONFIG_ARCH_SEATTLE=y
 CONFIG_ARCH_SYNQUACER=y
 CONFIG_ARCH_RENESAS=y
 CONFIG_ARCH_R8A774A1=y
+CONFIG_ARCH_R8A774C0=y
 CONFIG_ARCH_R8A7795=y
 CONFIG_ARCH_R8A7796=y
 CONFIG_ARCH_R8A77965=y