soc/amd/picasso: Remove unnecessary includes from pmutil.c

While working on psp_verstage, I noticed that this file had a number of
unnecessary includes.  Remove them.

BUG=b:158124527
TEST=Build & boot psp_verstage on trembyle

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I32188e2dda39ece9dc98d0344824d997a2e80303
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42065
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/soc/amd/picasso/pmutil.c

@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <acpi/acpi.h>
-#include <soc/southbridge.h>
-#include <amdblocks/acpimmio.h>
-#include <security/vboot/vboot_common.h>
 #include <security/vboot/vbnv.h>
 #include <pc80/mc146818rtc.h>