drm/amdgpu/display: Fix compilation issues

[Why]
Getting below build errors:
drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:1419:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
                default:
                ^
drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:1535:2: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
        default:
        ^

drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:3276:20: error: variable 'v1_5' is uninitialized when used here [-Werror,-Wuninitialized]
                        for (i = 0; i < v1_5->number_of_path; ++i)
                                        ^~~~

[How]
Fix compilation issues
Signed-off-by: Chandan Vurdigere Nataraj <chandan.vurdigerenataraj@amd.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1415,7 +1415,7 @@ static enum bp_result bios_parser_get_lttpr_caps(
 		case 5:
 			result = get_disp_caps_v4_5(bp, dce_caps);
 			*dce_caps = !!(*dce_caps & DCE_INFO_CAPS_LTTPR_SUPPORT_ENABLE);
-
+			break;
 		default:
 			break;
 		}
@@ -1532,6 +1532,7 @@ static enum bp_result bios_parser_get_embedded_panel_info(
 		default:
 			break;
 		}
+		break;
 	default:
 		break;
 	}
@@ -3259,6 +3260,7 @@ static enum bp_result get_bracket_layout_record(
 	}
 	tbl = &bp->object_info_tbl;
 	v1_4 = tbl->v1_4;
+	v1_5 = tbl->v1_5;
 
 	result = BP_RESULT_NORECORD;
 	switch (bp->object_info_tbl.revision.minor) {