sb/intel/i82801gx: Fix 16-bit read/write PCI_COMMAND register

Change-Id: I11b8743234cb1292db8c930edecf8fb5c47d63fd
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40741
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/southbridge/intel/i82801gx/azalia.c b/src/southbridge/intel/i82801gx/azalia.c
index 4a2b50e..775326c 100644
--- a/src/southbridge/intel/i82801gx/azalia.c
+++ b/src/southbridge/intel/i82801gx/azalia.c
@@ -230,8 +230,7 @@
 	pci_write_config32(dev, 0x120, reg32);
 
 	/* Set Bus Master */
-	reg32 = pci_read_config32(dev, PCI_COMMAND);
-	pci_write_config32(dev, PCI_COMMAND, reg32 | PCI_COMMAND_MASTER);
+	pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
 
 	pci_write_config8(dev, 0x3c, 0x0a); // unused?