virtio-console: Rename virtio-serial.c back to virtio-console.c

This file was renamed to ease the reviews of the recent changes
that went in.

Now that the changes are done, rename the file back to its original
name.
Signed-off-by: NAmit Shah <amit.shah@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Makefile.objs

@@ -127,7 +127,7 @@ user-obj-y += cutils.o cache-utils.o
 
 hw-obj-y =
 hw-obj-y += loader.o
-hw-obj-y += virtio.o virtio-serial.o
+hw-obj-y += virtio.o virtio-console.o
 hw-obj-y += fw_cfg.o
 hw-obj-y += watchdog.o
 hw-obj-$(CONFIG_ECC) += ecc.o