Bluetooth: hci_raw: Fix ECC support

When the ECC code was last time refactored hci_raw.c was forgotten
about. This fixes the issue so that ECC works again with hci_raw.

Change-Id: I1b1df66f1b2a311db611b9936ec074c88caf4143
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>