staging/lustre: get rid of seqno_t and mdsno_t typedefs

seqno_t is u64 and mdsno_t is u32 so just use them as such.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>