Represents an RPMB operation, which consists of sending one or more frames then receiving zero
or more frames. The tx_frames and rx_frames VMOs will be transferred to the protocol
implementation, so clients should keep duplicates of them if access is needed after the call to
Request().
The request will be aborted as soon as an error is encountered, meaning the read operation will
not be performed if the write operation failed. Invalid parameters passed through tx_frames or
rx_frames will cause an error to be returned immediately, without either operation having been
performed.