sysvinit-inittab: ensure unique label for SERIAL_CONSOLES entries
The label field in /etc/inittab entries needs to be unique, and the
numeric label being used for the SERIAL_CONSOLES getty entries was
clashing with the entries added for standard ttyX entries added via
SYSVINIT_ENABLED_GETTYS. Use the part after "tty" in the device name
(which is what the comment further down explicitly says should be done)
as the label rather than a simple incrementing number.
Fixes [YOCTO #4374].
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Saul Wold <sgw@linux.intel.com>
