Add dataflash to ecos.db

[Jonathan Larmour]

I accidentally forgot the dataflash driver so see the attached patch. I
also may as well switch the synthetic target to the v2 driver. At some
point we'll need to consider retiring the v1 driver. It can be now if
people don't mind.

Obviously there's plenty of scope for people to be switching their own
favourite targets to the am29xxxxx/strata v2 flash drivers, and I encourage
them to submit patches to do so!

Jifl
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