drm/amd/display: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding multiple break statements instead of just
letting the code fall through to the next case.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/bios/bios_parser.c

@@ -1198,6 +1198,7 @@ static enum bp_result bios_parser_get_embedded_panel_info(
 		default:
 			break;
 		}
+		break;
 	default:
 		break;
 	}

drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c

@@ -903,6 +903,7 @@ static enum bp_result bios_parser_get_soc_bb_info(
 			break;
 		case 4:
 			result = get_soc_bb_info_v4_4(bp, soc_bb_info);
+			break;
 		default:
 			break;
 		}
@@ -1019,6 +1020,7 @@ static enum bp_result bios_parser_get_embedded_panel_info(
 		default:
 			break;
 		}
+		break;
 	default:
 		break;
 	}

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -1060,6 +1060,7 @@ static bool dc_link_detect_helper(struct dc_link *link,
 
 				return false;
 			}
+			break;
 		default:
 			break;
 		}