usb: usbtmc: Optimize read/write and add ioctls for auto_abort

- Optimize read/write functions for better bandwidth and fixes reading of long transfers

- add ioctl USBTMC_IOCTL_AUTO_ABORT to configure auto_abort for each specific file handle.

- add ioctl USBTMC_IOCTL_MSG_IN_ATTR that returns the specific bmTransferAttributes field of the last DEV_DEP_MSG_IN Bulk-IN header. This header is received by the read() function. The meaning of the (u8) bitmap bmTransferAttributes is:
Bit 0 = EOM flag is set when the last of a USBTMC message is received.
Bit 1 = is set when the last byte is a termchar (e.g. '\n'). Note that this bit is always zero when the device does not support termchar feature or when termchar detection is not enabled (see ioctl USBTMC_IOCTL_CONFIG_TERMCHAR).