nb/intel/ironlake: Move southbridge code to ibexpeak

There's no need to set up the southbridge in the northbridge code.

Change-Id: I0f80c92aca885812c27a8803c2745844d8dfb939
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43689
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/src/southbridge/intel/ibexpeak/pch.h b/src/southbridge/intel/ibexpeak/pch.h
index 437259c..7c2e2a9 100644
--- a/src/southbridge/intel/ibexpeak/pch.h
+++ b/src/southbridge/intel/ibexpeak/pch.h
@@ -38,6 +38,7 @@
 void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue);
 void enable_usb_bar(void);
 
+void ibexpeak_setup_bars(void);
 void early_pch_init(void);
 
 void early_thermal_init(void);