nb/intel/ironlake: Add definition for SAD PCI device

Let's hope this cheers up the poor System Address Decoder device.

Tested with BUILD_TIMELESS=1, Packard Bell MS2290 does not change.

Change-Id: Ia62c05abb07216dc1ba449c3a17f8d53050b5af1
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43732
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/northbridge/intel/ironlake/ironlake.h

@@ -48,8 +48,10 @@
 #include "hostbridge_regs.h"
 
 /*
- * QPI D0:F1
+ * SAD - System Address Decoder
  */
+#define QPI_SAD			PCI_DEV(QUICKPATH_BUS, 0, 1)
+
 #define QPD0F1_PAM(x)		(0x40 + (x)) /* 0-6 */
 #define QPD0F1_SMRAM		0x4d	/* System Management RAM Control */