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nrfx_uart bug

Hi,

nrfx_uart.c has a bug where, once there is a RX error, the receiver gets stuck in a disabled state forever.  This is because p_cb->rx_enabled is never set true, so the error handler in uart_irq_handler disables the RX task.  This fixes it:

@@ -406,60 +408,12 @@ nrfx_err_t nrfx_uart_rx(nrfx_uart_t const * p_instance,
 
     if ((!p_cb->rx_enabled) && (!second_buffer))
     {
-        rx_enable(p_instance);
+        nrfx_uart_rx_enable(p_instance);
     }

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