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

The Bluetooth Core spec does not allow a LE PA Create sync command to be
sent to Controller if another one is pending (Vol 4, Part E, page 2493).

In order to avoid this issue, the HCI_CONN_CREATE_PA_SYNC was added
to mark that the LE PA Create Sync command has been sent for a hcon.
Once the PA 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>

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