Fix EMC2305 manufacturer ID

[mkeeter]

...and remove disclaimer, now that we've tested things

[mkeeter]

We're going to leave this open while Nathanael fights with the power sequencing on the FPGA, to avoid committing a bunch of FPGA images to the repo history.

[nathanaelhuffman]

I think we can get rid of some of the TODO-ish comments in grapefruit-seq-server's main

// Do we have to send the synchronization word ourself, or is it built
        // into the bitstream?
        // Same with device ID check

at line 164 and

the TODO at line 177/178 also.

GH won't let me comment there since you didn't touch them.

Otherwise lgtm!