Add analogWriteResolution

Author: pennam

PortentaBreakoutCarrier.h

@@ -198,6 +198,9 @@ class BreakoutCarrierClass {
         }
         return;
     }
+    void analogWriteResolution(int bits) {
+        BreakoutPWM::analogWriteResolution(bits);
+    }
     int analogRead(breakoutPin pin) {
         if (pin > -1) {
             int val;

utility/portentaBreakoutAnalog.h

@@ -175,5 +175,6 @@ class HRTIMPWMClass {
 
 
 void analogWrite(pin_size_t pin, int value);
+void analogWriteResolution(int bits);
 
 }