Merge pull request The-OpenROAD-Project#3441 from The-OpenROAD-Project-staging/mpl-notch-penalty

flow: update sky130hd/uW mpl params

Author: maliberty

flow/designs/sky130hd/microwatt/config.mk

@@ -35,6 +35,7 @@ export PLACE_DENSITY = 0.2
 
 # Extra effort to ease routing: avoid very tall std cell clusters in MPL.
 export RTLMP_MIN_AR = 0.40
+export RTLMP_NOTCH_WT = 20.0
 
 # CTS tuning
 export CTS_BUF_DISTANCE = 600