fastboot: blk: introduce fastboot block flashing support

Introduce fastboot block flashing functions and helpers
to be shared with the MMC implementation.

The write logic comes from the mmc implementation, while
the partition lookup is much simpler and could be extended.

For the erase logic, allmost no block drivers exposes the
erase operation, except mmc & virtio, so in order to allow
erasiong any partition a soft-erase logic has been added
to write zero-ed buffers in a loop.

Signed-off-by: Dmitrii Merkurev <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Tested-by: Mattijs Korpershoek <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mattijs Korpershoek <[email protected]>

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