sb/intel/lynxpoint: Define SerialIO devfns

This reduces differences with Broadwell.

Tested with BUILD_TIMELESS=1, Google Panther remains identical.

Change-Id: I81c34fd03a176d0575f2fbd254052d90f2b38487
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43367
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
diff --git a/src/southbridge/intel/lynxpoint/pch.h b/src/southbridge/intel/lynxpoint/pch.h
index 896454f..db3d92a 100644
--- a/src/southbridge/intel/lynxpoint/pch.h
+++ b/src/southbridge/intel/lynxpoint/pch.h
@@ -143,6 +143,17 @@
 #define PCH_PCS			0x84
 #define  PCH_PCS_PS_D3HOT	3
 
+/* SerialIO */
+#define PCH_DEVFN_SDMA		PCI_DEVFN(0x15, 0)
+#define PCH_DEVFN_I2C0		PCI_DEVFN(0x15, 1)
+#define PCH_DEVFN_I2C1		PCI_DEVFN(0x15, 2)
+#define PCH_DEVFN_SPI0		PCI_DEVFN(0x15, 3)
+#define PCH_DEVFN_SPI1		PCI_DEVFN(0x15, 4)
+#define PCH_DEVFN_UART0		PCI_DEVFN(0x15, 5)
+#define PCH_DEVFN_UART1		PCI_DEVFN(0x15, 6)
+
+#define PCH_DEVFN_SDIO		PCI_DEVFN(0x17, 0)
+
 #define PCH_EHCI1_DEV		PCI_DEV(0, 0x1d, 0)
 #define PCH_EHCI2_DEV		PCI_DEV(0, 0x1a, 0)
 #define PCH_XHCI_DEV		PCI_DEV(0, 0x14, 0)