Rename all Stm32f1 to STM32F1 (#12639)

Marlin/src/HAL/HAL_STM32F1/HAL.h

 #include "../shared/math_32bit.h"
 #include "../shared/HAL_SPI.h"
 
-#include "fastio_Stm32f1.h"
-#include "watchdog_Stm32f1.h"
+#include "fastio_STM32F1.h"
+#include "watchdog_STM32F1.h"
 
-#include "HAL_timers_Stm32f1.h"
+#include "HAL_timers_STM32F1.h"
 
 
 // --------------------------------------------------------------------------

Marlin/src/HAL/HAL_STM32F1/HAL_Servo_Stm32f1.cpp → Marlin/src/HAL/HAL_STM32F1/HAL_Servo_STM32F1.cpp

 
 uint8_t ServoCount; //=0
 
-#include "HAL_Servo_Stm32f1.h"
+#include "HAL_Servo_STM32F1.h"
 
 //#include "Servo.h"
 

Marlin/src/HAL/HAL_STM32F1/HAL_timers_Stm32f1.cpp → Marlin/src/HAL/HAL_STM32F1/HAL_timers_STM32F1.cpp

 
 #include "HAL.h"
 
-#include "HAL_timers_Stm32f1.h"
+#include "HAL_timers_STM32F1.h"
 
 // --------------------------------------------------------------------------
 // Externals

Marlin/src/HAL/HAL_STM32F1/watchdog_Stm32f1.cpp → Marlin/src/HAL/HAL_STM32F1/watchdog_STM32F1.cpp

 #if ENABLED(USE_WATCHDOG)
 
 #include <libmaple/iwdg.h>
-#include "watchdog_Stm32f1.h"
+#include "watchdog_STM32F1.h"
 
 void watchdogSetup(void) {
   // do whatever. don't remove this function.

platformio.ini

 platform      = ststm32@<4.4.0
 framework     = arduino
 board         = genericSTM32F103RE
-build_flags   = !python Marlin/src/HAL/HAL_STM32F1/stm32f1_flag_script.py
+build_flags   = !python Marlin/src/HAL/HAL_STM32F1/STM32F1_flag_script.py
   ${common.build_flags}
 lib_deps      = ${common.lib_deps}
 lib_ignore    = U8glib-HAL
 framework     = arduino
 board         = genericSTM32F103ZE
 extra_scripts = buildroot/share/PlatformIO/scripts/mks_robin.py
-build_flags   = !python Marlin/src/HAL/HAL_STM32F1/stm32f1_flag_script.py
+build_flags   = !python Marlin/src/HAL/HAL_STM32F1/STM32F1_flag_script.py
   ${common.build_flags}
 src_filter    = ${common.default_src_filter} +<src/HAL/HAL_STM32F1>
 lib_deps      = ${common.lib_deps}
 platform    = ststm32
 framework   = arduino
 board       = malyanM200
-build_flags = !python Marlin/src/HAL/HAL_STM32F1/stm32f1_flag_script.py -DMCU_STM32F103CB -D __STM32F1__=1 -std=c++1y -D MOTHERBOARD="BOARD_MALYAN_M200" -DSERIAL_USB -ffunction-sections -fdata-sections -Wl,--gc-sections
+build_flags = !python Marlin/src/HAL/HAL_STM32F1/STM32F1_flag_script.py -DMCU_STM32F103CB -D __STM32F1__=1 -std=c++1y -D MOTHERBOARD="BOARD_MALYAN_M200" -DSERIAL_USB -ffunction-sections -fdata-sections -Wl,--gc-sections
 src_filter  = ${common.default_src_filter} +<src/HAL/HAL_STM32F1>
 #-<frameworks>
 lib_ignore  =