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

Change-Id: I212ef304a03d068232f50a71c318e2b468336339
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40791
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/southbridge/intel/ibexpeak/azalia.c b/src/southbridge/intel/ibexpeak/azalia.c
index eb75b12..c57bd9a 100644
--- a/src/southbridge/intel/ibexpeak/azalia.c
+++ b/src/southbridge/intel/ibexpeak/azalia.c
@@ -262,8 +262,7 @@
 	pci_write_config32(dev, 0xd0, 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?