accel/amdxdna: Stop job scheduling across aie2_release_resource()

Running jobs on a hardware context while it is in the process of
releasing resources can lead to use-after-free and crashes.

Fix this by stopping job scheduling before calling
aie2_release_resource() and restarting it after the release completes.
Additionally, aie2_sched_job_run() now checks whether the hardware
context is still active.

Fixes: 4fd6ca90fc7f ("accel/amdxdna: Refactor hardware context destroy routine")
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Link: https://patch.msgid.link/20260130003255.2083255-1-lizhi.hou@amd.com

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