[Cryptech Tech] RTC on Alpha

[Fredrik Thulin]

Hi

The suggestion has been made to remove the external RTC chip currently on the 
Alpha schematics, and instead just rely on the RTC inside the ARM.

The end of the discussion last time was Basil asking which chip was more 
likely to be possible to tamper with. I think the answer is "they are both 
pretty easy to tamper with if you have code execution privileges in the ARM".

OK to remove external chip? The internal RTC is likely easier to interface 
with, so it saves us engineering time.

/Fredrik
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