nb/intel/ironlake: Use MMCONF_BUS_NUMBER everywhere

Bootblock enabling needs some special handling. Also, the definition of
the `get_pcie_bar` function is incorrect for Ironlake, so remove it.

With this patch, using 64 and 128 for MMCONF_BUS_NUMBER should work.
However, it has not been tested. Using 256 busses should still work.

Change-Id: Ic466ddc7b80f60af5cbff53583281440f02974c7
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49761
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/ironlake/ironlake.h

@@ -21,7 +21,7 @@
 
 #include "memmap.h"
 
-#define QUICKPATH_BUS 0xff
+#define QUICKPATH_BUS (CONFIG_MMCONF_BUS_NUMBER - 1)
 
 #include <southbridge/intel/ibexpeak/pch.h>