hdl: Swapping 32-bit places for I and Q.

The host has an easier time dealing with samples as I being first
followed by Q.
cli: Changed print out of samplerate for RX and TX to be consistent.
cli: Set frequency bounds checking.
lib: Add band selection when setting frequency.
Merge branch 'bladerf' of github.com:Nuand/bladeRF into dev-cli_add_rx_tx