hw/display: make edid configurable

Use CONFIG_EDID to make edid-generate.c and edid-region.c
configurable.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20190123065618.3520-26-yang.zhong@intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

default-configs/pci.mak

@@ -49,3 +49,4 @@ CONFIG_IVSHMEM_DEVICE=$(CONFIG_IVSHMEM)
 CONFIG_ROCKER=y
 CONFIG_VFIO=$(CONFIG_LINUX)
 CONFIG_VFIO_PCI=y
+CONFIG_EDID=y

hw/display/Makefile.objs

-common-obj-y += edid-generate.o
+common-obj-$(CONFIG_EDID) += edid-generate.o edid-region.o
 
 common-obj-$(CONFIG_FW_CFG_DMA) += ramfb.o
 common-obj-$(CONFIG_FW_CFG_DMA) += ramfb-standalone.o
@@ -15,12 +15,10 @@ common-obj-$(CONFIG_SSD0323) += ssd0323.o
 common-obj-$(CONFIG_XEN) += xenfb.o
 
 common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
-common-obj-$(CONFIG_VGA_PCI) += edid-region.o
 common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
 common-obj-$(CONFIG_VGA_ISA_MM) += vga-isa-mm.o
 common-obj-$(CONFIG_VMWARE_VGA) += vmware_vga.o
 common-obj-$(CONFIG_BOCHS_DISPLAY) += bochs-display.o
-common-obj-$(CONFIG_BOCHS_DISPLAY) += edid-region.o
 
 common-obj-$(CONFIG_BLIZZARD) += blizzard.o
 common-obj-$(CONFIG_EXYNOS4) += exynos4210_fimd.o