Revert "MPU Hal (#1492)"

This reverts commit eed4296890.

furi/core/memmgr.c

@@ -36,8 +36,10 @@ void* calloc(size_t count, size_t size) {
 }
 
 char* strdup(const char* s) {
-    // arg s marked as non-null, so we need hack to check for NULL
-    furi_check(((uint32_t)s << 2) != 0);
+    const char* s_null = s;
+    if(s_null == NULL) {
+        return NULL;
+    }
 
     size_t siz = strlen(s) + 1;
     char* y = pvPortMalloc(siz);