Revert deprecation of FlashIAPBlockDevice 2 argument constructor has this was a breaking change. This follows a similar change in the external flashiap-driver repo.
Make the built-in FileSystem::get_default_instance() implementation
instantiate storage as "flash" or "sd", with "default" as an alias.
This will aid interworking between simple and advanced filesystem code
on various platforms. The expectation is that the names "sd" or "flash"
will be always available if the device is available and configured,
regardless of what "default" represents.
"/fs" is a tautology - not a good name for the default filing system, as
whereever we use it, we know we're specifying a filing system. Rename to
"/default".
Marcus Chang
Yossi Levy
Kevin Bracey