Bluetooth: Fix sending unnecessary HCI_LE_Host_Enable

This patch fixes sending an unnecessary HCI_LE_Host_Enable command if
the command has already been sent as part of the default HCI init
sequence.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>