arm64: defconfig: Enable GPIO_SYSCON

roc-rk3328-cc board has vcc_sdio regulator controlled by a special
output only gpio pin. This special pin can now be reference as
<&grf_gpio 0> via gpio-syscon driver, as mentioned in below commit.

commit <99165b93> ("arm64: dts: rockchip: add sdmmc UHS support for
roc-rk3328-cc")

So, enable bydefault on the defconfig.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Link: https://lore.kernel.org/r/20230719102427.3617577-1-jagan@amarulasolutions.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/configs/defconfig

@@ -618,6 +618,7 @@ CONFIG_GPIO_PCA953X_IRQ=y
 CONFIG_GPIO_BD9571MWV=m
 CONFIG_GPIO_MAX77620=y
 CONFIG_GPIO_SL28CPLD=m
+CONFIG_GPIO_SYSCON=y
 CONFIG_POWER_RESET_MSM=y
 CONFIG_POWER_RESET_QCOM_PON=m
 CONFIG_POWER_RESET_XGENE=y