PCI: endpoint: test: Synchronously cancel command handler work

Use cancel_delayed_work_sync() in pci_epf_test_epc_deinit() to ensure
that the command handler is really stopped before proceeding with DMA
and BAR cleanup.

The same change is also done in pci_epf_test_link_down() to ensure that
the link down handling completes with the command handler fully stopped.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Damien Le Moal <[email protected]>
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Reviewed-by: Frank Li <[email protected]>

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