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PD#SWPL-1219 Problem: On arm64, thread stack is 16KB for each task. If running task number is large, this type of memory may over 40MB. It's a large amount on small memory platform. But most case thread only use less 4KB stack. It's waste of memory and we need optimize it. Solution: 1. Pre-allocate a vmalloc address space for task stack; 2. Only map 1st page for stack and handle page fault in EL1 when stack growth triggered exception; 3. handle stack switch for exception. Verify: p212 Change-Id: I47f511ccfa2868d982bc10a820ed6435b6d52ba9 Signed-off-by: tao zeng <tao.zeng@amlogic.com>