treewide: Drop ACPI_VIDEO_DEVICE macro

It was always defined to the same value, and only used twice.

Change-Id: I2736eb7ea2cf15475f7bb99d7d12450730eb8be0
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40864
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/autoport/bd82x6x.go

@@ -192,10 +192,6 @@ func (b bd82x6x) Scan(ctx Context, addr PCIDevData) {
 		DSDTDefine{
 			Key:   "BRIGHTNESS_DOWN",
 			Value: "\\_SB.PCI0.GFX0.DECB",
-		},
-		DSDTDefine{
-			Key:   "ACPI_VIDEO_DEVICE",
-			Value: "\\_SB.PCI0.GFX0",
 		})
 
 	/* SPI init */