🐛 Fix FYSETC Cheetah v2.0 build (#22926)

buildroot/share/PlatformIO/boards/marlin_FYSETC_CHEETAH_V20.json

         "0x3748"
       ]
     ],
-    "ldscript": "stm32f401rc.ld",
     "mcu": "stm32f401rct6",
     "variant": "MARLIN_FYSETC_CHEETAH_V20"
   },
       "dfu",
       "jlink"
     ],
-	"offset_address": "0x800C000",
+	"offset_address": "0x8008000",
     "require_upload_port": true,
     "use_1200bps_touch": false,
     "wait_for_upload_port": false

buildroot/share/PlatformIO/variants/MARLIN_FYSETC_CHEETAH_V20/ldscript.ld

 /* Specify the memory areas */
 MEMORY
 {
-FLASH (rx)      : ORIGIN = 0x800C000, LENGTH = 256K
+FLASH (rx)      : ORIGIN = 0x8008000, LENGTH = 256K - 32K
 RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 64K
 }
 

ini/stm32f4.ini

 platform           = ${common_stm32.platform}
 extends            = stm32_variant
 board              = marlin_FYSETC_CHEETAH_V20
-board_build.offset = 0xC000
+board_build.offset = 0x8000
 build_flags        = ${stm32_variant.build_flags} -DSTM32F401xC
 
 #