fmcomms2: Update c5soc system_timing script

projects/fmcomms2/c5soc/system_timing.tcl

@@ -1,3 +1,16 @@
 
-report_timing -detail path_only -npaths 20 -file timing_impl.log
-  
+set worst_path [get_timing_paths -npaths 1 -setup]
+foreach_in_collection path $worst_path {
+  set slack [get_path_info $path -slack]
+}
+
+if {$slack > 0} {
+  set worst_path [get_timing_paths -npaths 1 -hold]
+  foreach_in_collection path $worst_path {
+    set slack [get_path_info $path -slack]
+  }
+}
+
+if {$slack < 0} {
+  use_this_invalid_command_to_crash
+}