Bluetooth: hci_sync: Update the CIS host feature when enabling LE

The Connected Isochronous Stream (Host Support) feature bit is only set
during init, based on LE being enabled at that time. If LE is enabled
afterwards without the init being repeated, as happens when the
controller is still auto powered on after registration, the bit stays
cleared and controllers enforcing it reject LE Create CIS with Command
Disallowed.

Update the bit whenever LE Host Supported is written, so it follows the
LE state.

Fixes: 709788b154ca ("Bluetooth: hci_core: Fix using {cis,bis}_capable for current settings")
Assisted-by: OpenCode:claude-opus-5.5
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>