AP_Compass: removed annoying startup messages

these happen due to sensor probing for older configs

libraries/AP_Compass/AP_Compass_AK09916.cpp

@@ -201,7 +201,6 @@ bool AP_Compass_AK09916::init()
     }
 
     if (!_reset()) {
-        hal.console->printf("AK09916: Reset Failed\n");
         goto fail;
     }
 

libraries/AP_Compass/AP_Compass_AK8963.cpp

@@ -123,7 +123,6 @@ bool AP_Compass_AK8963::init()
     AP_HAL::Semaphore *bus_sem = _bus->get_semaphore();
 
     if (!bus_sem) {
-        hal.console->printf("AK8963: Unable to get bus semaphore\n");
         return false;
     }
     _bus->get_semaphore()->take_blocking();

libraries/AP_Compass/AP_Compass_LSM303D.cpp

@@ -290,7 +290,6 @@ bool AP_Compass_LSM303D::_hardware_init()
     // Test WHOAMI
     uint8_t whoami = _register_read(ADDR_WHO_AM_I);
     if (whoami != WHO_I_AM) {
-        hal.console->printf("LSM303D: unexpected WHOAMI 0x%x\n", (unsigned)whoami);
         goto fail_whoami;
     }