Lower placement densities on asap7/cva6, asap7/aes-block

Work around high congestion after allowing more asap7 cells. 

Signed-off-by: Martin Povišer <povik@cutebit.org>

Author: povik

flow/designs/asap7/aes-block/config.mk

@@ -11,7 +11,7 @@ export ABC_AREA               = 1
 export CORE_UTILIZATION       = 20
 export CORE_ASPECT_RATIO      = 1
 export CORE_MARGIN            = 2
-export PLACE_DENSITY          = 0.60
+export PLACE_DENSITY          = 0.55
 
 export BLOCKS ?= aes_rcon aes_sbox
 export SYNTH_HIERARCHICAL = 1

flow/designs/asap7/cva6/config.mk

@@ -81,7 +81,7 @@ export SDC_FILE               = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NAME)/constr
 
 export DIE_AREA               = 0 0 350 350
 export CORE_AREA              = 1.08 1.08 340 340
-export PLACE_DENSITY          = 0.50
+export PLACE_DENSITY          = 0.45
 export MACRO_HALO             = 5 5
 
 # a smoketest for this option, there are a