SM6FBQ / HackRF clone - History

HackRF One: change R60 from 0 ohms to 100 ohms

This matches R31 and was intended to be done when R31 was changed to 100
ohms.

HackRF One: populate R83 instead of R84

This removes clock buffer chaining which was intended to be done when
the RC delay was added.

HackRF One: clean up

- silkscreen
- fabrication attributes
- dates
- copyright
- README

HackRF One: adjust clock phase with RC delay

Remove chaining of buffers to delay GCK2 and instead use an RC delay for
both GCK2 and SGPIO_CLK.