fusee: restore DRAM to 204MHz before starting main cpu on Mariko (closes #1600). ...

Nintendo's Mariko tables result in trained frequency of 1599999 instead of 1600000.

PCV checks for rate == 1600000 exactly, when doing EMC init.

Thus EMC init does not succeed if we are trained to 1600000.

PCV has a fudge factor of 1000 used in SetEmcDvfsFreq, but this is not used in InitEmcDvfs.

This failure means that PCV cannot change rate back to 204MHz before sleep, and then after
wake extremely degraded performance is observed.

Restoring DRAM to 204MHz before boot causes EMC init to succeed/fixes performance degradation.