HV: rename core.c to vdev.c

core.c contains functions all related to pci vdev management, so it makes sense
to give it a more meaningful file name.

Tracked-On: #2534
Signed-off-by: dongshen <dongsheng.x.zhang@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: donsheng

hypervisor/Makefile

@@ -212,7 +212,7 @@ C_SRCS += hw/pci.c
 
 C_SRCS += dm/vpic.c
 C_SRCS += dm/vioapic.c
-C_SRCS += dm/vpci/core.c
+C_SRCS += dm/vpci/vdev.c
 C_SRCS += dm/vpci/vpci.c
 ifeq ($(CONFIG_PARTITION_MODE),y)
 C_SRCS += dm/vmptable.c