usb_dev: Implement read_packet() callback

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Update qiprog submodule

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Add helper functions for manipulating JEDEC-compliant chips

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Stellaris: Link to JEDEC helper functions

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>