Staging: lustre: obdclass: cl_lock: Declare as static

Declare cl_lock_intransit and cl_lock_extransit as static since they
are used only in this particular file.

Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>