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<https://github.com/The-OpenROAD-Project/OpenLane/issues/769|#769 drop -clk_nets in cts.tcl>
New issue created by <https://github.com/maliberty|maliberty>
*Description*

In cts.tcl you have:  
clock_tree_synthesis {*}arg_list  
...  
-clk_nets $::env(CLOCK_NET)\

-clk_nets isn't needed if the clocks are defined in SDC. CTS will automatically find the clock nets from STA.

*Environment*

master

*Reproduction Material*

any design

*Expected behavior*

simpler flow
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>