fix: use updated pdn script from @smunaut

ihp/pdn.tcl

@@ -1,18 +1,16 @@
 # global connections
-add_global_connection -net {VDD} -pin_pattern {^VDD$} -power
-add_global_connection -net {VDD} -pin_pattern {^VDDPE$}
-add_global_connection -net {VDD} -pin_pattern {^VDDCE$}
-add_global_connection -net {VSS} -pin_pattern {^VSS$} -ground
-add_global_connection -net {VSS} -pin_pattern {^VSSE$}
+add_global_connection -net {VPWR} -pin_pattern {^VDD$} -power
+add_global_connection -net {VPWR} -pin_pattern {^VDDPE$}
+add_global_connection -net {VPWR} -pin_pattern {^VDDCE$}
+add_global_connection -net {VGND} -pin_pattern {^VSS$} -ground
+add_global_connection -net {VGND} -pin_pattern {^VSSE$}
 global_connect
 
 # voltage domains
-set_voltage_domain -name {CORE} -power {VDD} -ground {VSS}
+set_voltage_domain -name {CORE} -power {VPWR} -ground {VGND}
 
 # standard cell grid
-define_pdn_grid -name {grid} -voltage_domains {CORE}
-add_pdn_stripe -grid {grid} -layer {Metal1} -width {0.44} -pitch {7.56} -offset {0} -extend_to_boundary -followpins
-add_pdn_stripe -grid {grid} -layer {Metal5} -width {2.200} -pitch {75.6} -offset {13.600} -extend_to_boundary
-add_pdn_stripe -grid {grid} -layer {TopMetal1} -width {1.800} -pitch {75.6} -offset {13.570} -extend_to_boundary
+define_pdn_grid -name {grid} -voltage_domains {CORE} -pins Metal5
+add_pdn_stripe -grid {grid} -layer {Metal1} -width {0.44} -pitch {7.56} -offset {0} -followpins
+add_pdn_stripe -grid {grid} -layer {Metal5} -width {2.200} -pitch {75.6} -offset {13.600} -extend_to_core_ring
 add_pdn_connect -grid {grid} -layers {Metal1 Metal5}
-add_pdn_connect -grid {grid} -layers {Metal5 TopMetal1}