soc/intel/broadwell/adsp: Fix 8-bit write on PCI_INTERRUPT_LINE register

The PCI_INTERRUPT_LINE register is one byte wide.
Possible side effects of clearing the three bytes after PCI_INTERRUPT_LINE are unknown.

Change-Id: I64e785309b0bf7f4d74436ea12a2444092deae22
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41009
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/broadwell/adsp.c b/src/soc/intel/broadwell/adsp.c
index 27368c0..897f9c4 100644
--- a/src/soc/intel/broadwell/adsp.c
+++ b/src/soc/intel/broadwell/adsp.c
@@ -115,7 +115,7 @@
 		printk(BIOS_INFO, "ADSP: Enable PCI Mode IRQ23\n");
 
 		/* Configure for PCI mode */
-		pci_write_config32(dev, PCI_INTERRUPT_LINE, ADSP_PCI_IRQ);
+		pci_write_config8(dev, PCI_INTERRUPT_LINE, ADSP_PCI_IRQ);
 
 		/* Clear ACPI Interrupt Enable Bit */
 		pch_iobp_update(ADSP_IOBP_PCICFGCTL,