imx_sdp: use do_response in read/write_memory
imx_sdp: use do_response in read/write_memory

Continue to collapse the same functionality: Use do_response
to read security state of the device (Report 3). This changes
behavior slightly since we now read 64 bytes with Report 3 (as
we do in every other case when reading security configuration).
Tests using a i.MX 6DL were successful.

Signed-off-by: Stefan Agner <8bf81831f67286fff829779134e88c94b37210a1@toradex.com>

boundarydevices/imx_usb_loader,bwalle/imx_usb_loader