arch/riscv: remove drivers/${ARCH} [3/10]

PD#SWPL-68240

Problem:
remove drivers/${ARCH}

Solution:
remove drivers/${ARCH}

Verify:
all projects

Signed-off-by: Kelvin Zhang <kelvin.zhang@amlogic.com>
Change-Id: I25d31ed0876f696484b3c620656d871a8646b061
1 file changed