intel/gma: Don't bluntly enable I/O

The allocator should take care of this.

Change-Id: I4ec88ebe23b4dcab069f764decc8b9b0c6e6a142
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40726
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/pineview/gma.c

@@ -224,7 +224,7 @@ static void gma_func0_init(struct device *dev)
 
 	/* IGD needs to be Bus Master */
 	reg32 = pci_read_config32(dev, PCI_COMMAND);
-	reg32 |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
+	reg32 |= PCI_COMMAND_MASTER;
 	pci_write_config32(dev, PCI_COMMAND, reg32);
 
 	if (!CONFIG(MAINBOARD_DO_NATIVE_VGA_INIT)) {