[Cryptech Core] Timing fix for SHA-512

[Joachim Strömbergson]

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Aloha!

I've just merged the timing fixes for the SHA-512 core. The core is now
capable of running at 125 MHz. A good margin when running the FPGA at
100 MHz. The changes does not modify interfaces/API and should work
directly. The number of clock cycles to perform a hash operation has (of
course) changed.

The important thing to verify on system level is that an update RNG with
the pipelined SHA-512 core still generates random numbers. It should,
but better safe than sorry.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Assured AB
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