arch/riscv: Remove the COMPILER reference for RISCV. [2/2]

PD#SWPL-61630

Problem:
Remove the COMPILER reference for RISCV.

Solution:
Remove the COMPILER reference for RISCV.

Verify:
T5W_AT301/T5W_AT309

Change-Id: I3fa0324b7b4d4712586fb66558d616637404c837
Signed-off-by: Xiaohu.Huang <xiaohu.huang@amlogic.com>
1 file changed