arm64: kconfig: add submenu for 8.2 architectural features

UAO is a feature of ARMv8.2, so add a submenu like we have for 8.1.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm64/Kconfig

@@ -769,6 +769,8 @@ config ARM64_LSE_ATOMICS
 
 endmenu
 
+menu "ARMv8.2 architectural features"
+
 config ARM64_UAO
 	bool "Enable support for User Access Override (UAO)"
 	default y
@@ -790,6 +792,8 @@ config ARM64_UAO
 	  regular load/store instructions if the cpu does not implement the
 	  feature.
 
+endmenu
+
 config ARM64_MODULE_CMODEL_LARGE
 	bool