LU-6142 lustre: change obd_ioctl_getdata() args

LU-6142 lustre: change obd_ioctl_getdata() args

Instead of passing a pointer to 'char *' to obd_ioctl_getdata(),
pass a pointer to 'struct obd_ioctl_data *'.
This seems more natural, and avoid needing extra 'char *data'
variables wherever the function is called.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I0287cd2fafd071a2580d48a52498469ceded3e79
Reviewed-on: https://review.whamcloud.com/39381
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>