runners: pyocd: add --telnet-port parameter

With multiple debug probes attached, attempting to launch multiple debug
servers resulted in "OSError: [Errno 98] Address already in use" despite
explicitly setting --gdb-port to unique values.

The issue was caused by the default telnet port: 4444. Adding
--telnet-port parameter allows to explicitly define the address to a
unique value and avoid the socket exception.

Signed-off-by: Rihards Skuja <rihardssk@mikrotik.com>