Increase the valid name of the iface to IFNAMSIZ

Define MAX_IFACE_LENGTH as IFNAMSIZ instead of 10, to
prevent netd from treating an interface name 'rmnet_sdio0'
as invalid.
Also fix an off-by-one error.

Change-Id: If6b2b27d2da6eb72f01c090cbe4f7dc2b9c296ae
3 files changed