block: make blk_create_device() static

There are no users of the blk_create_device() function outside the uclass.
Let's make it static. This will ensure that new block drivers will use
blk_create_devicef().

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
2 files changed