FPGA Manager fix for 5.14

Kajol's fix adds a missing pmu_migrate_context() call which presents a
problem if the CPU collecting FME PMU data is taken offline.

All patches have been reviewed on the mailing list, and have been in the
last few linux-next releases (as part of my fixes branch) without issues.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
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