Reduce set of power-down / power-up commands about drampower HOT 3 CLOSED

I agree to get rid of the _F and _S distinciton.

But, to explore different PDN strategies i would keep it separated:

In DRAMSys and gem5 we have:
PDNA
PDNP
SREF

it is a necessary feature to keep it seperated.

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(this thread is old, but still relevant, so here's a question):

I understand that we need an SREF command and a PDN command, however, I don't think we need distinct PDNA or PDNP commands. If a PDN command is given, while one or more banks are active, then this means the memory enters active powerdown mode. If all banks are precharged, then a PDN command means we enter precharged power-down mode. This is completely unambiguous, and closer to how a real DRAM behaves.

I propose to:

• Add a flag variable to select either fast or slow mode. I'll have to see where it fits best (memspec, command line / class initialization, or somewhere else, or maybe everywhere).
• For backwards compatibility, we can retain all the power down/up commands for now, but simply dispatch them all to 1 shared command handler. I'll add a PDN and PUP command.
• Make our example use the new commands. Nothing should change in the output, but we will be able to simplify the command handlers.

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In the latest standards there is no slow/fast entry any more.

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