toolchain: enable internal for aarch64

Enable the internal toolchain backend for aarch64.
Tested with arm_foundationv8_defconfig and ARMs foundation v8 emulator.
Both glibc & eglibc work.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

toolchain/Config.in

@@ -43,7 +43,7 @@ choice
 
 config BR2_TOOLCHAIN_BUILDROOT
 	bool "Buildroot toolchain"
-	depends on !BR2_aarch64 && !BR2_nios2
+	depends on !BR2_nios2
 	select BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
 
 config BR2_TOOLCHAIN_EXTERNAL