staging: lustre: uapi: don't memory allocate in UAPI header

The inline function lustre_cfg_new() calls kzalloc() but
this is a UAPI header. Remove kzalloc() and rename the
function to lustre_cfg_init(). The lustre kernel code
that was calling lustre_cfg_new() can doing the memory
allocation and pass the new buffer to lustre_cfg_init()
to fill in.

Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6401
Reviewed-on: https://review.whamcloud.com/26966


Reviewed-by: Quentin Bouget <quentin.bouget@cea.fr>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>