dmaengine: idxd: fix group conf_dev lifetime

mainline inclusion
from mainline-v5.13
commit defe49f9
category: bugfix
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I596WO


CVE: NA

Intel-SIG: commit defe49f9 dmaengine: idxd: fix group conf_dev lifetime.
Incremental backporting patches for DSA/IAA on Intel Xeon platform.

--------------------------------

Remove devm_* allocation and fix group->conf_dev 'struct device'
lifetime. Address issues flagged by CONFIG_DEBUG_KOBJECT_RELEASE.
Add release functions in order to free the allocated memory at the
group->conf_dev destruction time.

Reported-by: Jason Gunthorpe <jgg@nvidia.com>
Fixes: bfe1d560 ("dmaengine: idxd: Init and probe for Intel data accelerators")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/161852987144.2203940.8830315575880047.stgit@djiang5-desk3.ch.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>