nrfx_ncft: Add callback for RXFRAMESTART event #78
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When first using nrfx_ncft directly, I found it odd that while I had subscribed to NRFX_NFCT_EVT_RX_FRAMESTART, that event wasn't being raised like the others I was subscribed to. I've added a check in nrfx_nfct_irq_handler to raise that callback when NRFX_NFCT_EVT_ACTIVE(RXFRAMESTART). As nrfx_ncft doesn't need to process/handle anything else there, the only other thing it does is clears the event flag.