Non blocking sd_temp_get (using value captured for crystal derived LF tuning)

[snoopy20]

According to the doc;

 * This function will block until the temperature measurement is done.
 * It takes around 50 us from call to return.

Instead I'd like to return the value that was attained by the periodic LF tuning code inside the softdevice code. How to do it?

[snoopy20]

Ok forget that, I'll just pull the data from the TEMP registers by polling. Sorted.