Disambiguate i2c calls

Marlin/src/feature/dac/dac_mcp4728.cpp

  */
 void mcp4728_init() {
   Wire.begin();
-  Wire.requestFrom(I2C_ADDRESS(DAC_DEV_ADDRESS), 24);
+  Wire.requestFrom(I2C_ADDRESS(DAC_DEV_ADDRESS), uint8_t(24));
   while (Wire.available()) {
     char deviceID = Wire.read(),
          hiByte = Wire.read(),

Marlin/src/feature/encoder_i2c.cpp

 
   encoderCount.val = 0x00;
 
-  if (Wire.requestFrom(I2C_ADDRESS(i2cAddress), 3) != 3) {
+  if (Wire.requestFrom(I2C_ADDRESS(i2cAddress), uint8_t(3)) != 3) {
     //houston, we have a problem...
     H = I2CPE_MAG_SIG_NF;
     return 0;
   Wire.endTransmission();
 
   // Read value
-  if (Wire.requestFrom(I2C_ADDRESS(address), 32)) {
+  if (Wire.requestFrom(I2C_ADDRESS(address), uint8_t(32))) {
     char c;
     while (Wire.available() > 0 && (c = (char)Wire.read()) > 0)
       SERIAL_ECHO(c);