Apply #pragma once, misc cleanup (#12322)

* Apply #pragma once in headers
* Adjust some thermistors formatting
* Misc cleanup and formatting

Marlin/src/HAL/HAL_STM32F7/fastio_STM32F7.h

@@ -20,15 +20,13 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Fast I/O interfaces for STM32F7
  * These use GPIO functions instead of Direct Port Manipulation, as on AVR.
  */
 
-#ifndef _FASTIO_STM32F7_H
-#define _FASTIO_STM32F7_H
-
 #define _BV(b) (1 << (b))
 
 #define READ(IO)                digitalRead(IO)
@@ -186,5 +184,3 @@
 #define PG13 _STM32_PIN(G, 13)
 #define PG14 _STM32_PIN(G, 14)
 #define PG15 _STM32_PIN(G, 15)
-
-#endif // _FASTIO_STM32F7_H