userspace/libwr: get rid or warnings about pr_info

Annoying warnings like:

In file included from ./include/libwr/hal_shmem.h:7:0,
                 from ./include/libwr/fan.h:3,
                 from ./include/libwr/switch_hw.h:6,
                 from pps_gen.c:17:
./include/libwr/generic_fsm.h: In function ‘fsm_consume_state’:
./include/libwr/generic_fsm.h:134:3: warning: implicit declaration of function ‘pr_info’ [-Wimplicit-function-declaration]
   pr_info("%s: Enter state %s\n", fsm->fsm_name, fsm_get_state_name(fsm));
   ^
Signed-off-by: Michal Wasiak <michal.wasiak@gmail.com>