fw/kernel/tasks: fix ifdeffery typo for SF32LB52 MPU regions

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

Author: gmarull

src/fw/kernel/pebble_tasks.c

@@ -212,7 +212,7 @@ void pebble_task_create(PebbleTask pebble_task, TaskParameters_t *task_params,
 
   const MpuRegion *region_ptrs[portNUM_CONFIGURABLE_REGIONS] = {
     // FIXME(SF32LB52): Not supported on ARMv8 MPU yet
-#ifdef MICRO_FAMILY_SF32LB52
+#ifndef MICRO_FAMILY_SF32LB52
     &app_region,
     &worker_region,
     stack_guard_region,