drm/i915/fdi: convert BUG()'s to MISSING_CASE()

These shouldn't happen, but in the off chance they do, we'll want a
warning rather than panic.
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b86132ac63f43f79e51eb63f948beccba85bf449.1629906431.git.jani.nikula@intel.com

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

@@ -93,7 +93,8 @@ static int ilk_check_fdi_lanes(struct drm_device *dev, enum pipe pipe,
 		}
 		return 0;
 	default:
-		BUG();
+		MISSING_CASE(pipe);
+		return 0;
 	}
 }
 
@@ -217,7 +218,7 @@ static void ivb_update_fdi_bc_bifurcation(const struct intel_crtc_state *crtc_st
 
 		break;
 	default:
-		BUG();
+		MISSING_CASE(crtc->pipe);
 	}
 }