mock-array: set_dont_touch no longer needed

I don't know why the hold cells were needed in the first
place, but with this sequence of changs, set_dont_touch
is no longer needed.

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/designs/asap7/mock-array/constraints.sdc

@@ -13,5 +13,3 @@ set non_clock_inputs [lsearch -inline -all -not -exact [all_inputs] $clk_port]
 
 set_input_delay  [expr $clk_period * $clk_io_pct] -clock $clk_name $non_clock_inputs 
 set_output_delay [expr $clk_period * $clk_io_pct] -clock $clk_name [all_outputs]
-
-set_dont_touch [get_nets ces_*_*]