Bluetooth: SMP: Fix setting key distribution bits for no-bonding

9.4.2 section, Part C, Vol 3 of the Bluetooth Core specification v5.3
states the following in the case that the device is in non-bondable
mode:

If Security Manager pairing is supported, the Host shall set the
Bonding_Flags to ‘No Bonding’ as defined in [Vol 3] Part H, Section
3.5.1 and bonding information shall not be exchanged or stored.

Fixes #54104

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>