arm64: Always select ARM_AMBA and GENERIC_GPIO

Needed for most SoCs.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/Kconfig

@@ -2,6 +2,7 @@ config ARM64
 	def_bool y
 	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+	select ARM_AMBA
 	select CLONE_BACKWARDS
 	select COMMON_CLK
 	select GENERIC_CLOCKEVENTS
@@ -90,6 +91,9 @@ config SWIOTLB
 config IOMMU_HELPER
 	def_bool SWIOTLB
 
+config GENERIC_GPIO
+	def_bool y
+
 source "init/Kconfig"
 
 source "kernel/Kconfig.freezer"