Mixed changes

- Added automatic utcb map/prefaulting of forked tasks for fs0
  so that it does not need to explicitly request those tasks from mm0.
  Eliminating fs0 requests to mm0 reduce deadlock possibilities.

- Replaced kmalloc with a public malloc implementation because of a bug in kmalloc.
- Fixed a kfree bug. default_release_pages was trying to free page_array pages.

tasks/mm0/include/lib/malloc.h

@@ -0,0 +1,19 @@
+#ifndef __PRIVATE_MALLOC_H__
+#define __PRIVATE_MALLOC_H__
+
+#include <stddef.h>
+#include <string.h>
+
+void *kmalloc(size_t size);
+void kfree(void *blk);
+
+static inline void *kzalloc(size_t size)
+{
+	void *buf = kmalloc(size);
+
+	memset(buf, 0, size);
+	return buf;
+}
+
+
+#endif /*__PRIVATE_MALLOC_H__ */