Bluetooth: ISO: Do not emit LE BIG Create Sync if previous is pending

[ Upstream commit 42ecf1947135110ea08abeaca39741636f9a2285 ]

The Bluetooth Core spec does not allow a LE BIG Create sync command to be
sent to Controller if another one is pending (Vol 4, Part E, page 2586).

In order to avoid this issue, the HCI_CONN_CREATE_BIG_SYNC was added
to mark that the LE BIG Create Sync command has been sent for a hcon.
Once the BIG Sync Established event is received, the hcon flag is
erased and the next pending hcon is handled.

Signed-off-by: Iulia Tanasescu <iulia.tanasescu@nxp.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Stable-dep-of: 07a9342b94a9 ("Bluetooth: ISO: Send BIG Create Sync via hci_sync")
Signed-off-by: Sasha Levin <sashal@kernel.org>