🐛 HAL refactor followup (#23354)

Marlin/src/HAL/SAMD51/HAL.h

   static void adc_init();
 
   // Called by Temperature::init for each sensor at startup
-  static void adc_enable(const uint8_t ch);
+  static inline void adc_enable(const uint8_t ch) {}
 
   // Begin ADC sampling on the given channel
   static void adc_start(const pin_t pin);

Marlin/src/HAL/STM32/HAL_SPI.cpp

   uint8_t spiRec() {
     hal.isr_off();                                                // No interrupts during byte receive
     const uint8_t data = HAL_SPI_STM32_SpiTransfer_Mode_3(0xFF);
-    hal.isr_off();                                                // Enable interrupts
+    hal.isr_on();                                                 // Enable interrupts
     return data;
   }
 

Marlin/src/HAL/STM32F1/HAL.h

   static void adc_init();
 
   // Called by Temperature::init for each sensor at startup
-  static void adc_enable(const pin_t pin);
+  static inline void adc_enable(const pin_t pin) { pinMode(pin, INPUT_ANALOG); }
 
   // Begin ADC sampling on the given channel
   static void adc_start(const pin_t pin);

Marlin/src/HAL/TEENSY31_32/HAL.h

   static void adc_init();
 
   // Called by Temperature::init for each sensor at startup
-  static void adc_enable(const pin_t ch);
+  static inline void adc_enable(const pin_t ch) {}
 
   // Begin ADC sampling on the given channel
   static void adc_start(const pin_t ch);

Marlin/src/HAL/TEENSY40_41/HAL.h

   static void adc_init();
 
   // Called by Temperature::init for each sensor at startup
-  static void adc_enable(const pin_t pin);
+  static inline void adc_enable(const pin_t pin) {}
 
   // Begin ADC sampling on the given channel
   static void adc_start(const pin_t pin);