nb/intel/ironlake: Drop copy-pasted and unused macro

Tested with BUILD_TIMELESS=1, packardbell/ms2290 remains identical.

Change-Id: I78856707864563e392626a494f0e77eec9802002
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42702
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/northbridge/intel/ironlake/finalize.c

@@ -2,8 +2,6 @@
 
 #include "ironlake.h"
 
-#define PCI_DEV_SNB PCI_DEV(0, 0, 0)
-
 void intel_ironlake_finalize_smm(void)
 {
 	MCHBAR32_OR(0x5500, 1 << 0);	/* PAVP */