isdn: potential buffer overflows

cs->ics.parm.setup.phone is a 32 character array.  In each of these
cases we're copying from a 35 character array into a 32 character array
so we should use strlcpy() instead of strcpy().

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>