Increase priority of syslink flow control interrupt #1103
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This PR increases the priority of the syslink flow control interrupt.
The syslink receive UART in the NRF (STM to NRF) is
connected to the STM for flow control. When the RX buffer is full, the STM is notified and is supposed to pause the transmission until the buffer is handled. On the STM side this flow control is handled by an interrupt and we suspect that the interrupt sometimes is a bit too slow. This leads to packet loss on the syslink from STM to the NRF (and on to a client on a PC).
This PR increases the priority of the flow control interrupt.
If the suspisions are correct, this should solve #998 but more tests need to be carried out in the stability lab.