STM32F1: Remove extra py imports (#15898)

buildroot/share/PlatformIO/scripts/STM32F103VE_longer.py

 
 # Rename ${PROGNAME}.bin and save it as 'project.bin' (No encryption on the Longer3D)
 def encrypt(source, target, env):
-    import os
-
     firmware = open(target[0].path, "rb")
     marlin_alfa = open(target[0].dir.path +'/project.bin', "wb")
     length = os.path.getsize(target[0].path)

buildroot/share/PlatformIO/scripts/chitu_crypt.py

 
 # Encrypt ${PROGNAME}.bin and save it as 'update.cbd'
 def encrypt(source, target, env):
-    import os
-
     firmware = open(target[0].path, "rb")
     update = open(target[0].dir.path +'/update.cbd', "wb")
     length = os.path.getsize(target[0].path)

buildroot/share/PlatformIO/scripts/jgaurora_a5s_a1_with_bootloader.py

 
 #append ${PROGNAME}.bin firmware after bootloader and save it as 'jgaurora_firmware.bin'
 def addboot(source,target,env):
-	import os
-
 	firmware = open(target[0].path, "rb")
 	lengthfirmware = os.path.getsize(target[0].path)
 	bootloader_dir = "buildroot/share/PlatformIO/scripts/jgaurora_bootloader.bin"

buildroot/share/PlatformIO/scripts/mks_robin.py

 
 # Encrypt ${PROGNAME}.bin and save it as 'Robin.bin'
 def encrypt(source, target, env):
-    import os
     import sys
 
     key = [0xA3, 0xBD, 0xAD, 0x0D, 0x41, 0x11, 0xBB, 0x8D, 0xDC, 0x80, 0x2D, 0xD0, 0xD2, 0xC4, 0x9B, 0x1E, 0x26, 0xEB, 0xE3, 0x33, 0x4A, 0x15, 0xE4, 0x0A, 0xB3, 0xB1, 0x3C, 0x93, 0xBB, 0xAF, 0xF7, 0x3E]

buildroot/share/PlatformIO/scripts/mks_robin_lite.py

 
 # Encrypt ${PROGNAME}.bin and save it as 'mksLite.bin'
 def encrypt(source, target, env):
-    import os
     import sys
 
     key = [0xA3, 0xBD, 0xAD, 0x0D, 0x41, 0x11, 0xBB, 0x8D, 0xDC, 0x80, 0x2D, 0xD0, 0xD2, 0xC4, 0x9B, 0x1E, 0x26, 0xEB, 0xE3, 0x33, 0x4A, 0x15, 0xE4, 0x0A, 0xB3, 0xB1, 0x3C, 0x93, 0xBB, 0xAF, 0xF7, 0x3E]

buildroot/share/PlatformIO/scripts/mks_robin_mini.py

 import os
-
 Import("env")
 
 # Relocate firmware from 0x08000000 to 0x08007000
 
 # Encrypt ${PROGNAME}.bin and save it as 'Robin_mini.bin'
 def encrypt(source, target, env):
-    import os
     import sys
 
     key = [0xA3, 0xBD, 0xAD, 0x0D, 0x41, 0x11, 0xBB, 0x8D, 0xDC, 0x80, 0x2D, 0xD0, 0xD2, 0xC4, 0x9B, 0x1E, 0x26, 0xEB, 0xE3, 0x33, 0x4A, 0x15, 0xE4, 0x0A, 0xB3, 0xB1, 0x3C, 0x93, 0xBB, 0xAF, 0xF7, 0x3E]

buildroot/share/PlatformIO/scripts/mks_robin_nano.py

 
 # Encrypt ${PROGNAME}.bin and save it as 'Robin_nano.bin'
 def encrypt(source, target, env):
-    import os
     import sys
 
     key = [0xA3, 0xBD, 0xAD, 0x0D, 0x41, 0x11, 0xBB, 0x8D, 0xDC, 0x80, 0x2D, 0xD0, 0xD2, 0xC4, 0x9B, 0x1E, 0x26, 0xEB, 0xE3, 0x33, 0x4A, 0x15, 0xE4, 0x0A, 0xB3, 0xB1, 0x3C, 0x93, 0xBB, 0xAF, 0xF7, 0x3E]