Bluetooth: hci_sync: Ignore errors from HCI_OP_REMOTE_NAME_REQ_CANCEL

This ignores errors from HCI_OP_REMOTE_NAME_REQ_CANCEL since it
shouldn't interfere with the stopping of discovery and in certain
conditions it seems to be failing.

Link: https://github.com/bluez/bluez/issues/575


Fixes: d0b13706 ("Bluetooth: hci_sync: Rework init stages")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>