mock-array: add reporting

looks like reporting is useful for testing purposes, ref
The-OpenROAD-Project/OpenROAD#4850 (comment)

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

Author: oharboe

flow/designs/asap7/mock-array/config.mk

@@ -57,7 +57,4 @@ export FASTROUTE_TCL = ./designs/$(PLATFORM)/mock-array/fastroute.tcl
 export MACRO_HALO_X            = 0.5
 export MACRO_HALO_Y            = 0.5
 
-export GND_NETS_VOLTAGES      =
-export PWR_NETS_VOLTAGES      =
-
 export CTS_ARGS = -insertion_delay -sink_clustering_enable -balance_levels -distance_between_buffers 60