soc/riscv: Instead of use Kconfig items to compiler flags. [1/1]

PD#SWPL-68240

Problem:
Refactor for all.

Solution:
Instead of use Kconfig items to compiler flags.

Verify:
N/A

Change-Id: If43d62932f542ee9d0466047cc79198b2f693fa4
Signed-off-by: Xiaohu.Huang <xiaohu.huang@amlogic.com>
11 files changed