drivers: ieee802154: propagate frame counter to upper layer
drivers: ieee802154: propagate frame counter to upper layer

When frame counter is managed by the radio driver the upper layer
needs to be informed about the frame counter changed. The upper layer
looks for the most recent frame counter in the transmitted frame,
this is why the tx_payload need to be updated after processed by
the radio driver.

Signed-off-by: Lukasz Maciejonczyk <12a52743b42a5ad3dc4d3a6e4f8a76d0ad7c6806@nordicsemi.no>

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