Lerdge K/S/X support for Flash Drive (#20593)

Marlin/src/pins/pins.h

 #elif MB(BTT_BTT002_V1_0)
   #include "stm32f4/pins_BTT_BTT002_V1_0.h"     // STM32F4                                env:BIGTREE_BTT002
 #elif MB(LERDGE_K)
-  #include "stm32f4/pins_LERDGE_K.h"            // STM32F4                                env:LERDGEK
+  #include "stm32f4/pins_LERDGE_K.h"            // STM32F4                                env:LERDGEK env:LERDGEK_usb_flash_drive
 #elif MB(LERDGE_S)
-  #include "stm32f4/pins_LERDGE_S.h"            // STM32F4                                env:LERDGES
+  #include "stm32f4/pins_LERDGE_S.h"            // STM32F4                                env:LERDGES env:LERDGES_usb_flash_drive
 #elif MB(LERDGE_X)
-  #include "stm32f4/pins_LERDGE_X.h"            // STM32F4                                env:LERDGEX
+  #include "stm32f4/pins_LERDGE_X.h"            // STM32F4                                env:LERDGEX env:LERDGEX_usb_flash_drive
 #elif MB(VAKE403D)
   #include "stm32f4/pins_VAKE403D.h"            // STM32F4
 #elif MB(FYSETC_S6)

Marlin/src/pins/stm32f4/pins_LERDGE_K.h

 
 #define I2C_EEPROM
 
+// USB Flash Drive support
+#define HAS_OTG_USB_HOST_SUPPORT
+
 //
 // Servos
 //

Marlin/src/pins/stm32f4/pins_LERDGE_S.h

 
 //#define I2C_EEPROM
 
+// USB Flash Drive support
+#define HAS_OTG_USB_HOST_SUPPORT
+
 //
 // Servos
 //

Marlin/src/pins/stm32f4/pins_LERDGE_X.h

 
 #define I2C_EEPROM
 
+// USB Flash Drive support
+#define HAS_OTG_USB_HOST_SUPPORT
+
 //
 // Servos
 //

platformio.ini

 board_build.firmware = Lerdge_X_firmware_force.bin
 
 #
+# Lerdge X with USB Flash Drive Support
+#
+[env:LERDGEX_usb_flash_drive]
+extends           = LERDGEX
+platform_packages = ${stm32_flash_drive.platform_packages}
+build_flags       = ${stm32_flash_drive.build_flags}
+
+#
 # Lerdge S
 #
 [env:LERDGES]
 board_build.firmware = Lerdge_firmware_force.bin
 
 #
+# Lerdge S with USB Flash Drive Support
+#
+[env:LERDGES_usb_flash_drive]
+extends           = LERDGES
+platform_packages = ${stm32_flash_drive.platform_packages}
+build_flags       = ${stm32_flash_drive.build_flags}
+
+#
 # Lerdge K
 #
 [env:LERDGEK]
   -DLERDGEK
 
 #
+# Lerdge K with USB Flash Drive Support
+#
+[env:LERDGEK_usb_flash_drive]
+extends           = LERDGEK
+platform_packages = ${stm32_flash_drive.platform_packages}
+build_flags       = ${stm32_flash_drive.build_flags}
+
+#
 # RUMBA32
 #
 [env:rumba32]