[Backport v4.0-branch] Bluetooth: Controller: Fix Tx Ack FIFO index corruption under race #92906
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Fix Tx Ack FIFO's first index being advanced beyond a recorded ack_last value in a node_rx when under race between ll_rx_get() being pre-empted while executing the `tx_cmplt_get()` and a call to `ll_rx_put()` in an interrupt service routine. Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no> (cherry picked from commit f6495d8)
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Backport f6495d8 from #92779.