[patch] comms/ltmdm: ltmdm.sh patch

Machine: Dell inspiron 8000 with Lucent Technology integrated
modem

The system panics on an incoming ring signal from the ltmdm.

Workaround: initializing the S0 register to a >=0 to max_value
fix the problem.

PR: ports/71951
Submitted by: raoul megelas <raoul.megelas@libertysurf.fr>