ARM64: Enable multi-core scheduler support by default

Make sure that the task scheduler domain hierarchy is set-up correctly
on systems with single or multi-cluster topology.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Acked-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index c8ccda1..5f76034 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -51,6 +51,7 @@
 CONFIG_PCI_MSI=y
 CONFIG_PCI_XGENE=y
 CONFIG_SMP=y
+CONFIG_SCHED_MC=y
 CONFIG_PREEMPT=y
 CONFIG_KSM=y
 CONFIG_TRANSPARENT_HUGEPAGE=y