arch/riscv: Refactor that add LTO optimization feature. [3/9]

PD#SWPL-68240

Problem:
Add LTO optimization feature supported.

Solution:
Add LTO optimization feature supported.

Verify:
N/A

Change-Id: If156220bc17c5496f7fc57a69ec5098268b4949f
Signed-off-by: xiaohu.huang <xiaohu.huang@amlogic.com>
2 files changed