drivers/isdn/hardware/eicon: fix sparse warnings: Should it be static?

drivers/isdn/hardware/eicon: fix sparse warnings: Should it be static?

Impact: Make symbols static.

Fix this sparse warnings:
  drivers/isdn/hardware/eicon/message.c:1197:6: warning: symbol 'connect_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1414:6: warning: symbol 'connect_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1570:6: warning: symbol 'connect_a_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1576:6: warning: symbol 'disconnect_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1631:6: warning: symbol 'disconnect_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1658:6: warning: symbol 'listen_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1707:6: warning: symbol 'info_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1816:6: warning: symbol 'info_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1822:6: warning: symbol 'alert_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:1852:6: warning: symbol 'facility_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:2602:6: warning: symbol 'facility_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:2608:6: warning: symbol 'connect_b3_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:2842:6: warning: symbol 'connect_b3_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:2957:6: warning: symbol 'connect_b3_a_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:2977:6: warning: symbol 'disconnect_b3_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:3033:6: warning: symbol 'disconnect_b3_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:3089:6: warning: symbol 'data_b3_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:3166:6: warning: symbol 'data_b3_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:3199:6: warning: symbol 'reset_b3_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:3240:6: warning: symbol 'reset_b3_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:3264:6: warning: symbol 'connect_b3_t90_a_res' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:3298:6: warning: symbol 'select_b_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:8692:6: warning: symbol 'sig_req' was not declared. Should it be static?
  drivers/isdn/hardware/eicon/message.c:8792:6: warning: symbol 'send_data' was not declared. Should it be static?

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: David S. Miller <davem@davemloft.net>