This tests functions accessible from blob_io_flash via `bt_mesh_blob_io`
object. Whole partition of slot1 is filled with test data using
flash_map API and then read using blob_io_flash, by reading it as blocks
and chunks. `chunk_wr` is tested my writing sample data of size of slot1
partition and checked if each chunk is written correctly, and if whole
partition is filled with correct data at the end. Both of these test
use `bt_mesh_blob_io_flash_init` and `io_open` to prepare stream and
call `block_start` at every new block to check if flash is prepared
correctly.
Signed-off-by: Krzysztof Kopyściński <krzysztof.kopyscinski@codecoup.pl>
Krzysztof Kopyściński