drm/i915: Sanitize the TypeC FIA lane configuration decoding

Use hex numbers, since that makes more sense when decoding a bit pattern.

No functional change.
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Animesh Manna <animesh.manna@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190628143635.22066-16-imre.deak@intel.com

drivers/gpu/drm/i915/display/intel_tc.c

@@ -52,15 +52,16 @@ int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port)
 	switch (lane_mask) {
 	default:
 		MISSING_CASE(lane_mask);
-	case 1:
-	case 2:
-	case 4:
-	case 8:
+		/* fall-through */
+	case 0x1:
+	case 0x2:
+	case 0x4:
+	case 0x8:
 		return 1;
-	case 3:
-	case 12:
+	case 0x3:
+	case 0xc:
 		return 2;
-	case 15:
+	case 0xf:
 		return 4;
 	}
 }