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Support the below BAR configuration methods for epf NTB. BAR 0: config and scratchpad BAR 2: doorbell BAR 4: memory map windows Set difference BAR number information into struct ntb_epf_data. So difference VID/PID can choose different BAR configurations. There are difference BAR map method between epf NTB and epf vNTB Endpoint function. Signed-off-by: Frank Li <Frank.Li@nxp.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>