KNOT-v02.01-rc01: bluetooth: services: setup_ot: Remove GATT encrypt

Remove encrypt protection from setup_ot service's characteristics.

This is necessary for devices that do not support bounding to connect
to the system.

Signed-off-by: Joao Cordeiro <[email protected]>

KNOT-v02.00: net: openthread: Use OT STORAGE flash partition

Use ot-storage flash sub-partition to store openthread settings instead
of placing it in the last pages of flash.

The OpenThread requires the defined sub-partition to be at least 2
pages big.

This change is necessary as some boards use the end of the flash to
store DFU and MBR data.

Signed-off-by: Joao Cordeiro <[email protected]>