ecp5: Allow setting drive strength for LVCMOS33D IOs
ecp5: Allow setting drive strength for LVCMOS33D IOs

SymbiFlow/nextpnr,YosysHQ/nextpnr,YosysHQ/nextpnr,SymbiFlow/nextpnr,SymbiFlow/nextpnr,YosysHQ/nextpnr,SymbiFlow/nextpnr,YosysHQ/nextpnr