sb/intel/i82801ix: Fix 16-bit read/write PCI_COMMAND register

Change-Id: I5a07a00e1183ef834d97c11268935617cfe17faa
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40794
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/southbridge/intel/i82801ix/hdaudio.c b/src/southbridge/intel/i82801ix/hdaudio.c
index e5b7906..434d0aa 100644
--- a/src/southbridge/intel/i82801ix/hdaudio.c
+++ b/src/southbridge/intel/i82801ix/hdaudio.c
@@ -247,8 +247,7 @@
 	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);
 
 	reg8 = pci_read_config8(dev, 0x4d); // Docking Status
 	reg8 &= ~(1 << 7); // Docking not supported