drm/i915/tgl: MOCS table update

The bspec was just updated with a minor correction to entry 61 (it
shouldn't have had the SCF bit set).

v2:
 - Add a MOCS_ENTRY_UNUSED() and use it to declare the
   explicitly-reserved MOCS entries. (Lucas)
 - Move the warning suppression from the Makefile to a #pragma that only
   affects the TGL table. (Lucas)

v3:
 - Entries 16 and 17 are identical to ICL now, so no need to explicitly
   adjust them (or mess with compiler warning overrides).

Bspec: 45101
Fixes: 2ddf9921 ("drm/i915/tgl: Define MOCS entries for Tigerlake")
Cc: Tomasz Lis <tomasz.lis@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Francisco Jerez <francisco.jerez.plata@intel.com>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Signed-off-by: NMatt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191112224757.25116-2-matthew.d.roper@intel.comReviewed-by: NFrancisco Jerez <currojerez@riseup.net>
Reviewed-by: NLucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: NTomasz Lis <tomasz.lis@intel.com>

drivers/gpu/drm/i915/gt/intel_mocs.c

@@ -263,7 +263,7 @@ static const struct drm_i915_mocs_entry tigerlake_mocs_table[] = {
 		   L3_1_UC),
 	/* HW Special Case (Displayable) */
 	MOCS_ENTRY(61,
-		   LE_1_UC | LE_TC_1_LLC | LE_SCF(1),
+		   LE_1_UC | LE_TC_1_LLC,
 		   L3_3_WB),
 };