soc/amd/common/block/psp: Remove unused northbridge header

BUG=b:147042464
TEST=Build trembyle

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I5df618f69a7dcca47b9733efb3699b37fd171e90
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41261
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/common/block/psp/psp.c

@@ -7,7 +7,6 @@
 #include <console/console.h>
 #include <amdblocks/psp.h>
 #include <soc/iomap.h>
-#include <soc/northbridge.h>
 #include "psp_def.h"
 
 static const char *psp_status_nobase = "error: PSP BAR3 not assigned";

src/soc/amd/common/block/psp/psp_gen2.c

@@ -5,7 +5,6 @@
 #include <bootstate.h>
 #include <amdblocks/psp.h>
 #include <soc/iomap.h>
-#include <soc/northbridge.h>
 #include "psp_def.h"
 
 static u16 rd_mbox_sts(struct pspv2_mbox *mbox)

src/soc/amd/common/block/psp/psp_smm.c

@@ -11,7 +11,6 @@
 #include <console/console.h>
 #include <amdblocks/psp.h>
 #include <soc/iomap.h>
-#include <soc/northbridge.h>
 #include "psp_def.h"
 
 #define C2P_BUFFER_MAXSIZE 0xc00 /* Core-to-PSP buffer */