bus: mhi: pci_generic: Remove WQ_MEM_RECLAIM flag from state workqueue

In the Linux kernel, the following vulnerability has been resolved:

bus: mhi: pci_generic: Remove WQ_MEM_RECLAIM flag from state workqueue

A recent change created a dedicated workqueue for the state-change work

with WQ_HIGHPRI (no strong reason for that) and WQ_MEM_RECLAIM flags,

but the state-change work (mhi_pm_st_worker) does not guarantee forward

progress under memory pressure, and will even wait on various memory

allocations when e.g. creating devices, loading firmware, etc... The

work is then not part of a memory reclaim path...

Moreover, this causes a warning in check_flush_dependency() since we end

up in code that flushes a non-reclaim workqueue:

[ 40.969601] workqueue: WQ_MEM_RECLAIM mhi_hiprio_wq:mhi_pm_st_worker [mhi] is flushing !WQ_MEM_RECLAIM events_highpri:flush_backlog

[ 40.969612] WARNING: CPU: 4 PID: 158 at kernel/workqueue.c:2607 check_flush_dependency+0x11c/0x140

[ 40.969733] Call Trace:

[ 40.969740] __flush_work+0x97/0x1d0

[ 40.969745] ? wake_up_process+0x15/0x20

[ 40.969749] ? insert_work+0x70/0x80

[ 40.969750] ? __queue_work+0x14a/0x3e0

[ 40.969753] flush_work+0x10/0x20

[ 40.969756] rollback_registered_many+0x1c9/0x510

[ 40.969759] unregister_netdevice_queue+0x94/0x120

[ 40.969761] unregister_netdev+0x1d/0x30

[ 40.969765] mhi_net_remove+0x1a/0x40 [mhi_net]

[ 40.969770] mhi_driver_remove+0x124/0x250 [mhi]

[ 40.969776] device_release_driver_internal+0xf0/0x1d0

[ 40.969778] device_release_driver+0x12/0x20

[ 40.969782] bus_remove_device+0xe1/0x150

[ 40.969786] device_del+0x17b/0x3e0

[ 40.969791] mhi_destroy_device+0x9a/0x100 [mhi]

[ 40.969796] ? mhi_unmap_single_use_bb+0x50/0x50 [mhi]

[ 40.969799] device_for_each_child+0x5e/0xa0

[ 40.969804] mhi_pm_st_worker+0x921/0xf50 [mhi]