riscv: Refactor CMakeLists.txt. [1/1]

PD#SWPL-68240

Problem:
Refactor CMakeLists.txt

Solution:
Refactor CMakeLists.txt

Verify:
N/A

Signed-off-by: Kelvin Zhang <kelvin.zhang@amlogic.com>
Change-Id: I10ebd22f913cf4b1cc1f71fc204cc5ab7c4170ea
6 files changed