Revert "AP_HAL_ChibiOS: disable watchdog in hwdef.h not in-line in code"

This reverts commit ccfad8ceea.

libraries/AP_HAL_ChibiOS/HAL_ChibiOS_Class.cpp

@@ -267,7 +267,7 @@ static void main_loop()
 #if !defined(DISABLE_WATCHDOG)
 #ifdef IOMCU_FW
     stm32_watchdog_init();
-#else
+#elif !defined(HAL_BOOTLOADER_BUILD)
     // setup watchdog to reset if main loop stops
     if (AP_BoardConfig::watchdog_enabled()) {
         stm32_watchdog_init();

libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py

@@ -1172,7 +1172,6 @@ class ChibiOSHWDef(object):
 #define HAL_USE_EMPTY_STORAGE 1
 #ifndef HAL_STORAGE_SIZE
 #define HAL_STORAGE_SIZE 16384
-#define DISABLE_WATCHDOG 1
 #endif
 ''')
             else:
@@ -1220,7 +1219,6 @@ class ChibiOSHWDef(object):
 #ifndef CH_CFG_USE_DYNAMIC
 #define CH_CFG_USE_DYNAMIC FALSE
 #endif
-#define DISABLE_WATCHDOG 1
 ''')
             if not self.env_vars['EXT_FLASH_SIZE_MB'] and not args.signed_fw:
                 f.write('''