LU-18006 osc: rework sdio locking

LU-18006 osc: rework sdio locking

We cannot hold a spinlock across a call to kthread_create,
so we have to rearrange the locking for this, moving the
locking inside the data copy function.  This handles the
multithreading in a slightly different spot.

Test-Parameters: testlist=sanity env=ONLY=119f,ONLY_REPEAT=100
Test-Parameters: testlist=sanity env=ONLY=119f,ONLY_REPEAT=100
Signed-off-by: Patrick Farrell <patrick.farrell@oracle.com>
Change-Id: I30c1c6600ebfe2e1fb54606608ea55469ae06937
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55649
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Qian Yingjin <qian@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>