staging: lustre: Remove lustre_eacl.h

The structures and the macros in the header file are not used
anywhere inside the kernel (verified by using grep). The structures
and macros were leftover from the patch
341f1f0a "staging: lustre: remove
remote client support". Also, removed the include statements for
lustre_eacl.h.

Signed-off-by: Gargi Sharma <gs051095@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>