tilegrid: remove iob CENTER_INT from segment
tilegrid: remove iob CENTER_INT from segment

Signed-off-by: John McMaster <527ca5438b47432dedda4309be2f991b71bfb11c@gmail.com>

SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray