staging: lustre: libcfs: remove use of __u* types

The __[u|s]* types are for UAPI headers or user
space. They shouldn't be used in core kernel code.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>