soc/intel/cannonlake: Disable `TccOffsetClamp` if no offset is given

Change-Id: I4f9b62fd944d8a91d53bc584c88797f23de1e5ca
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56660
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/soc/intel/cannonlake/fsp_params.c

@@ -611,6 +611,7 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 
 	/* Set TccActivationOffset */
 	tconfig->TccActivationOffset = config->tcc_offset;
+	tconfig->TccOffsetClamp = config->tcc_offset > 0;
 
 	/* Unlock all GPIO pads */
 	tconfig->PchUnlockGpioPads = config->PchUnlockGpioPads;