soc/amd/picasso: Notify PSP system is going to sleep state

BUG=b:153677737

Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Change-Id: Ic72bd5f5710181ca4f282feba5f7531b098c907a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40298
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/picasso/smihandler.c

@@ -220,6 +220,8 @@ static void sb_slp_typ_handler(void)
 						reg32);
 		} /* if (CONFIG(ELOG_GSMI)) */
 
+		psp_notify_sx_info(slp_typ);
+
 		/*
 		 * An IO cycle is required to trigger the STPCLK/STPGNT
 		 * handshake when the Pm1 write is reissued.