[SX126x] Fix image calibration (#1051)

src/modules/SX126x/SX126x.cpp

@@ -1841,8 +1841,13 @@ int16_t SX126x::setRfFrequency(uint32_t frf) {
   return(this->mod->SPIwriteStream(RADIOLIB_SX126X_CMD_SET_RF_FREQUENCY, data, 4));
 }
 
-int16_t SX126x::calibrateImage(float freqMin, float freqMax) {
+int16_t SX126x::calibrateImageRejection(float freqMin, float freqMax) {
+  // calculate the calibration coefficients and calibrate image
   uint8_t data[] = { (uint8_t)floor((freqMin - 1.0f) / 4.0f), (uint8_t)ceil((freqMax + 1.0f) / 4.0f) };
+  return(this->calibrateImage(data));
+}
+
+int16_t SX126x::calibrateImage(uint8_t* data) {
   int16_t state = this->mod->SPIwriteStream(RADIOLIB_SX126X_CMD_CALIBRATE_IMAGE, data, 2);
 
   // if something failed, show the device errors