Correct PWM_PIN behavior for STM32 HALs (#12027)

Marlin/src/HAL/HAL_STM32/HAL_spi_STM32.cpp

   // --------------------------------------------------------------------------
   // Software SPI
   // --------------------------------------------------------------------------
-  #error "Software SPI not supported for STM32F7. Use Hardware SPI."
+  #error "Software SPI not supported for STM32. Use Hardware SPI."
 
 #else
 

Marlin/src/HAL/HAL_STM32/fastio_STM32.h

 #pragma once
 
 /**
- * Fast I/O interfaces for STM32F7
+ * Fast I/O interfaces for STM32
  * These use GPIO functions instead of Direct Port Manipulation, as on AVR.
  */
 
 #define GET_OUTPUT(IO)
 #define GET_TIMER(IO)
 
-#define PWM_PIN(p) true
+#define PWM_PIN(p) digitalPinHasPWM(p)
 #define USEABLE_HARDWARE_PWM(p) PWM_PIN(p)

Marlin/src/HAL/HAL_STM32F1/fastio_Stm32f1.h

 #define GET_OUTPUT(IO)        (_GET_MODE(IO) == GPIO_OUTPUT_PP)
 #define GET_TIMER(IO)         (PIN_MAP[IO].timer_device != NULL)
 
-#define PWM_PIN(p) digitalPinHasPWM(p)
+#define PWM_PIN(p) true
 #define USEABLE_HARDWARE_PWM(p) PWM_PIN(p)
 
 #endif // _FASTIO_STM32F1_H

Marlin/src/HAL/HAL_STM32F4/fastio_STM32F4.h

 #define GET_OUTPUT(IO)
 #define GET_TIMER(IO)
 
-#define PWM_PIN(p) digitalPinHasPWM(p)
+#define PWM_PIN(p) true
 #define USEABLE_HARDWARE_PWM(p) PWM_PIN(p)
 
 //

Marlin/src/HAL/HAL_STM32F7/fastio_STM32F7.h

 #define GET_OUTPUT(IO)
 #define GET_TIMER(IO)
 
-#define PWM_PIN(p) digitalPinHasPWM(p)
+#define PWM_PIN(p) true
 #define USEABLE_HARDWARE_PWM(p) PWM_PIN(p)
 
 //