[RESEND PATCH v10 6/7] fpga: sec-mgr: enable cancel of secure update

Extend the FPGA Security Manager class driver to include an update/cancel sysfs file that can be written to request that an update be canceled. The write may return EBUSY if the update has progressed to the point that it cannot be canceled by software or ENODEV if there is no update in progress. S

[PATCH v10 6/7] fpga: sec-mgr: enable cancel of secure update

Extend the FPGA Security Manager class driver to include an update/cancel sysfs file that can be written to request that an update be canceled. The write may return EBUSY if the update has progressed to the point that it cannot be canceled by software or ENODEV if there is no update in progress. S