update gf180 9t openlane config:

set the right site
set padding similar to 7t

gf180mcu/openlane/gf180mcu_fd_sc_mcu9t5v0/config.tcl

diff --git a/gf180mcu/openlane/gf180mcu_fd_sc_mcu9t5v0/config.tcl b/gf180mcu/openlane/gf180mcu_fd_sc_mcu9t5v0/config.tcl
index 09ffd1f..12e567b 100644
--- a/gf180mcu/openlane/gf180mcu_fd_sc_mcu9t5v0/config.tcl
+++ b/gf180mcu/openlane/gf180mcu_fd_sc_mcu9t5v0/config.tcl
@@ -2,7 +2,7 @@
 
 # Placement site for core cells
 # This can be found in the technology lef
-set ::env(PLACE_SITE) "$::env(STD_CELL_LIBRARY)"
+set ::env(PLACE_SITE) "GF018hv5v_green_sc9"
 set ::env(PLACE_SITE_WIDTH) 0.56
 set ::env(PLACE_SITE_HEIGHT) 3.92
 
@@ -36,7 +36,6 @@
 set ::env(DIODE_CELL_PIN) "I"
 set ::env(DIODE_INSERTION_STRATEGY) {4}
 
-set ::env(CELL_PAD) 2
 set ::env(CELL_PAD_EXCLUDE) "$::env(STD_CELL_LIBRARY)__filltie_* $::env(STD_CELL_LIBRARY)__filldecap_* $::env(STD_CELL_LIBRARY)__fill_* $::env(STD_CELL_LIBRARY)__endcap_*"
 
 # TritonCTS configurations
@@ -49,3 +48,6 @@
 # The library maximum transition is 8.9ns; setting it to lower value
 set ::env(DEFAULT_MAX_TRAN) 3
 
+set ::env(GPL_CELL_PADDING) {0}
+set ::env(DPL_CELL_PADDING) {2}
+