1) u2p has added a new signal from the SRAM to the pinout, RAM_ZZ

which allows the SRAM to be placed in a sleep mode. This pin was
erroniously pulled high at the top level rendering the SRAM unusable.

2) Added declaration for extramfifo debug bus which had got deleted
at some point in the past

3) Created a debug bundle of signals from extsramfifo to help diagnose
problem 1)

4) u2p Rev1 PCB ommits control of any of the SRAM chip selects. Made a
code change so that control logic does not rely on the presence of this
pin and ensuring that the SRAM is always placed in READ mode in any idle cycles.

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