arm/arm64: KVM : Enable vhost device selection under KVM config menu

vhost drivers provide guest VMs with better I/O performance and lower
CPU utilization. This patch allows users to select vhost devices under
KVM configuration menu on ARM. This makes vhost support on arm/arm64
on a par with other architectures (e.g. x86, ppc).
Signed-off-by: NWei Huang <wei@redhat.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

arch/arm/kvm/Kconfig

@@ -46,4 +46,6 @@ config KVM_ARM_HOST
 	---help---
 	  Provides host support for ARM processors.
 
+source drivers/vhost/Kconfig
+
 endif # VIRTUALIZATION

arch/arm64/kvm/Kconfig

@@ -41,4 +41,6 @@ config KVM_ARM_HOST
 	---help---
 	  Provides host support for ARM processors.
 
+source drivers/vhost/Kconfig
+
 endif # VIRTUALIZATION