What:		/sys/class/fpga_region/<region>/compat_id
Date:		June 2018
KernelVersion:	4.19
Contact:	Wu Hao <hao.wu@intel.com>
Description:	FPGA region id for compatibility check, e.g. compatibility
		of the FPGA reconfiguration hardware and image. This value
		is defined or calculated by the layer that is creating the
		FPGA region. This interface returns the compat_id value or
		just error code -ENOENT in case compat_id is not used.