arm64: defconfig: Enable R8A774B1 SoC

Enable the Renesas RZ/G2N (R8A774B1) SoC in the ARM64 defconfig.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Link: https://lore.kernel.org/r/1568725530-55241-3-git-send-email-biju.das@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/configs/defconfig

@@ -741,6 +741,7 @@ CONFIG_QCOM_SMD_RPM=y
 CONFIG_QCOM_SMP2P=y
 CONFIG_QCOM_SMSM=y
 CONFIG_ARCH_R8A774A1=y
+CONFIG_ARCH_R8A774B1=y
 CONFIG_ARCH_R8A774C0=y
 CONFIG_ARCH_R8A7795=y
 CONFIG_ARCH_R8A7796=y