LU-17580 llite: Remove all referance of LOOKUP_CONTINUE

LU-17580 llite: Remove all referance of LOOKUP_CONTINUE

Newer kernel (3.1 and beyond) LOOKUP_CONTINUE flag is
replaced/same as LOOKUP_PARENT flag. Can safely
remove any definations of LOOKUP_CONTINUE

Linux-commit: 49084c3bb2055c401f3493c13edae14d49128ca0
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I05eac0ec1321d230c7a215f95888d4040b7c670a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54169
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: James Simmons <jsimmons@infradead.org>