Add custom types for position (#15204)

Marlin/src/feature/dac/dac_mcp4728.cpp

@@ -36,7 +36,7 @@
 
 #include "dac_mcp4728.h"
 
-uint16_t mcp4728_values[XYZE];
+xyze_uint_t mcp4728_values;
 
 /**
  * Begin I2C, get current values (input register and eeprom) of mcp4728
@@ -121,8 +121,8 @@ uint8_t mcp4728_getDrvPct(const uint8_t channel) { return uint8_t(100.0 * mcp472
  * Receives all Drive strengths as 0-100 percent values, updates
  * DAC Values array and calls fastwrite to update the DAC.
  */
-void mcp4728_setDrvPct(uint8_t pct[XYZE]) {
-  LOOP_XYZE(i) mcp4728_values[i] = 0.01 * pct[i] * (DAC_STEPPER_MAX);
+void mcp4728_setDrvPct(xyze_uint8_t &pct) {
+  mcp4728_values *= 0.01 * pct * (DAC_STEPPER_MAX);
   mcp4728_fastWrite();
 }