LU-16634 llite: move common ioctl code to ll_iocontrol()

LU-16634 llite: move common ioctl code to ll_iocontrol()

Move common ioctl cases from ll_dir_ioctl() and ll_file_ioctl()
into ll_iocontrol() to avoid duplicate code.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I1a0d2f839949debf346aa15c65b0f407e3ce7057
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50335
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>