Have bbram shell commands use the new SHELL_HELP macro
Also fix the syntax for "read" command as it wasn't
correctly indicating that count cannot be specified
without address.
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
Use shell_device_get_binding() instead of device_get_binding() so that
we get the device based on its name and in addition by its label.
Signed-off-by: Yishai Jaffe <yishai1999@gmail.com>