arm64: defconfig: enable syscon-poweroff driver

Enable the generic syscon-poweroff driver used on all Exynos ARM64 SoCs
(e.g. Exynos5433) and few APM SoCs.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20230901115732.45854-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/configs/defconfig

@@ -636,6 +636,7 @@ CONFIG_POWER_RESET_MSM=y
 CONFIG_POWER_RESET_QCOM_PON=m
 CONFIG_POWER_RESET_XGENE=y
 CONFIG_POWER_RESET_SYSCON=y
+CONFIG_POWER_RESET_SYSCON_POWEROFF=y
 CONFIG_SYSCON_REBOOT_MODE=y
 CONFIG_NVMEM_REBOOT_MODE=m
 CONFIG_BATTERY_SBS=m