Bluetooth: hci_h5: Remove ignored flag HCI_UART_RESET_ON_INIT

Since commit cba73646

 ("Bluetooth: hci_serdev: Remove setting of
HCI_QUIRK_RESET_ON_CLOSE."), this flag is ignored for hci_serdev users,
so let's remove setting it.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>