mb/system76/gaze15: Disable OC support

Clevo indicated that DIMMs running at 2933 MHz are not supported on a
number of processors used for this model.

Change-Id: Iadf611a64de664c783696e51cfe858ca95903936
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57897
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jeremy Soller <jeremy@system76.com>

src/mainboard/system76/gaze15/romstage.c

@@ -20,8 +20,5 @@ static const struct cnl_mb_cfg memcfg = {
 
 void mainboard_memory_init_params(FSPM_UPD *memupd)
 {
-	// Allow memory speeds higher than 2933 MT/s
-	memupd->FspmConfig.SaOcSupport = 1;
-
 	cannonlake_memcfg_init(&memupd->FspmConfig, &memcfg);
 }