Bluetooth: CSIS: Rename bt_csis_client_lock_get

Rename bt_csis_client_lock_get to
bt_csis_client_get_lock_state. `get` could be
misunderstood as acquire, i.e. that `get` would
mean that the lock was taken by this device.

The new name should make it more obviously that it
is just a read procedure.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
3 files changed