nangate45/swerv_wrapper: decrease routing layer adjustment

                         to solve high congestion during
                         global routing

Signed-off-by: Arthur Koucher <[email protected]>

Author: AcKoucher

flow/designs/nangate45/swerv_wrapper/fastroute.tcl

@@ -1,4 +1,4 @@
-set_global_routing_layer_adjustment metal2-metal3 0.25
-set_global_routing_layer_adjustment metal4-$::env(MAX_ROUTING_LAYER) 0.15
+set_global_routing_layer_adjustment metal2-metal3 0.20
+set_global_routing_layer_adjustment metal4-$::env(MAX_ROUTING_LAYER) 0.10
 
 set_routing_layers -signal $::env(MIN_ROUTING_LAYER)-$::env(MAX_ROUTING_LAYER)