sunxi: enable CONFIG_VHOST_NET like on x86

Other virtualization options are already enabled, so this is only a
small addition

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/sunxi/config-4.4

@@ -516,8 +516,7 @@ CONFIG_VDSO=y
 CONFIG_VECTORS_BASE=0xffff0000
 CONFIG_VFP=y
 CONFIG_VFPv3=y
-# CONFIG_VHOST_CROSS_ENDIAN_LEGACY is not set
-# CONFIG_VHOST_NET is not set
+CONFIG_VHOST_NET=y
 CONFIG_VIRTUALIZATION=y
 CONFIG_VM_EVENT_COUNTERS=y
 CONFIG_VT=y