PCI/VGA: Don't assume the only VGA device on a system is boot_vga

Some systems ship with multiple display class devices but not all
of them are VGA devices. If the "only" VGA device on the system is not
used for displaying the image on the screen marking it as `boot_vga`
because nothing was found is totally wrong.

This behavior actually leads to mistakes of the wrong device being
advertised to userspace and then userspace can make incorrect decisions.

As there is an accurate `boot_display` sysfs file stop lying about
`boot_vga` by assuming if nothing is found it's the right device.

Reported-by: Aaron Erhardt <[email protected]>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220712
Tested-by: Aaron Erhardt <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
Fixes: ad90860 ("fbcon: Use screen info to find primary device")
Tested-by: Luke D. Jones <[email protected]>
Signed-off-by: Mario Limonciello (AMD) <[email protected]>
Signed-off-by: Thomas Zimmermann <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: superm1

drivers/pci/vgaarb.c

@@ -652,13 +652,6 @@ static bool vga_is_boot_device(struct vga_device *vgadev)
 		return true;
 	}
 
-	/*
-	 * Vgadev has neither IO nor MEM enabled.  If we haven't found any
-	 * other VGA devices, it is the best candidate so far.
-	 */
-	if (!boot_vga)
-		return true;
-
 	return false;
 }