Bluetooth: Align the NBLE firmware version and upgrade SD

The latest NBLE firmware includes a new version
exchange mechanism that is independent from the
RPC function definition.  It also allows using
firmwares that are automatically generated by
the official builders without needing a local
build.
The upgrade of the softdevice fixes several
issues in PTS tests.  The major change in
term of API introduced by this upgrade is that
upon write requests, the offset and data of the
write request must be sent back to the softdevice.

Change-Id: Ie574047a09a4e6fdcbf775bc98d8a61f981cee0c
Signed-off-by: Louis Caron <louis.caron@intel.com>