Use safe clock freqs for AnalogOut; use DAC REFRESH on SAMD51. #649
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Use not >12MHz DAC clock on SAMD51 (using 2 MHz).
Use not >350kHz DAC clock on SAMD21 (using 320 kHz, with a newly configured GCLK1 (48MHz/150).
On SAMD51, turn on REFRESH for DAC, which allows static stable output (especially noticeable at lower analog values). REFRESH == 0 0 means off. REFRESH == 1 is not allowed. REFRESH > 1 indicates length of REFRESH period. I picked 2.
Tested on Metro M0 and M4.