soc/amd/picasso: Get rid of chip.h inclusion from southbridge.h

southbridge.h does not really need chip.h. So, this change removes the
inclusion of chip.h from it.

Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I09c87b975ecd5f7798da8dd858be0c729aef42de
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40822
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/picasso/include/soc/southbridge.h

@@ -8,7 +8,6 @@
 #include <device/device.h>
 #include <device/pci_def.h>
 #include <soc/iomap.h>
-#include "chip.h"
 
 /*
  * AcpiMmio Region