ice40: Add support for the 2nd bit of SHIFTREG_DIV_MODE
ice40: Add support for the 2nd bit of SHIFTREG_DIV_MODE

This requires the matching chipdb update from icestorm project !

Signed-off-by: Sylvain Munaut <349f318521b45672c77207abf1a5ed60eb011db1@246tNt.com>

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