drivers/nble: Update RPC to Nordic BLE firmware 0513

This is actually a revert from a previous revert. This updates RPC
following the very recent firmware development.

This reverts commit a146f9ef.

Change-Id: I67b517c3959b5b78a5ef80fbb338d6cc66e43e8e
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>