nb/amd/agesa/family15tn: define macro for internal HDMI audio controller

Following the example of CB:7630 done for family16kb boards
(git commit 3ff4f85ccd9fdb7cd4885a10f025b5ab297a445f).

Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Change-Id: Ic48c7475ceadb60f825ca9e3c3427c8a7525a266
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46589
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/northbridge/amd/agesa/family15tn/pci_devs.h b/src/northbridge/amd/agesa/family15tn/pci_devs.h
index ea79970..22ce8f5 100644
--- a/src/northbridge/amd/agesa/family15tn/pci_devs.h
+++ b/src/northbridge/amd/agesa/family15tn/pci_devs.h
@@ -12,6 +12,10 @@
 #define GFX_FUNC 0
 #define GFX_DEVFN PCI_DEVFN(GFX_DEV,GFX_FUNC)
 
+/* Integrated GPU Internal HDMI Audio Controller */
+#define ACTL_FUNC	1
+#define ACTL_DEVFN	PCI_DEVFN(GFX_DEV,ACTL_FUNC)
+
 /* PCIe Ports */
 #define NB_PCIE_PORT1_DEV 0x2
 #define NB_PCIE_PORT2_DEV 0x3