Bluetooth: Rename LE and ACL connection functions

These names were causing much confusion, so we rename these functions
that send HCI commands to be more similar in naming to the actual HCI
commands that will be sent.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>