arm64:zynqmp_defconfig: add GPIO_SYSFS and EXPERT

Enable CONFIG_GPIO_SYSFS and CONFIG_EXPERT to restore the functionality
of the linux_image_ADI-scripts/power-service/stingray_power.py script
for the X-Band Phased Array project. Also added CONFIG_NAMESPACES to
ensure that CONFIG_USER_NS does not get disabled when running make
savedefconfig. Bothe NAMESPACES and USER_NS were added in commit
492b6c7 and NAMESPACES was later removed in commit d31fa31.

Signed-off-by: Alex Sarbu <alex.sarbu@analog.com>

Author: Alexandru-Sarbu

arch/arm64/configs/adi_zynqmp_defconfig

@@ -13,8 +13,10 @@ CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_LOG_BUF_SHIFT=16
 CONFIG_CGROUPS=y
+CONFIG_NAMESPACES=y
 CONFIG_USER_NS=y
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_EXPERT=y
 CONFIG_PROFILING=y
 CONFIG_ARCH_ZYNQMP=y
 CONFIG_NR_CPUS=8
@@ -200,6 +202,7 @@ CONFIG_SPI_CADENCE=y
 CONFIG_SPI_XILINX=y
 CONFIG_SPI_ZYNQMP_GQSPI=y
 CONFIG_PINCTRL=y
+CONFIG_GPIO_SYSFS=y
 CONFIG_GPIO_XILINX=y
 CONFIG_GPIO_ZYNQ=y
 CONFIG_GPIO_PCA953X=y