Bluetooth: host: Fix MIC generation in Bluetooth CCM encryption

bt_ccm_encrypt only works when encrypting in place. To fix this
ccm_auth() inside bt_ccm_encrypt() must take plaintext instead of
enc_data, to not rely on assumption that plain and cypher data are the
same memory.

Signed-off-by: Ilya Makarov <ilya.makarov.592@gmail.com>

Fixes: #40069