We force select CPU_PM and provide asm/cpuidle.h so that we can
use CPU IDLE drivers for Linux RISC-V kernel.
Signed-off-by: NAnup Patel <anup.patel@wdc.com>
Signed-off-by: NAnup Patel <apatel@vetanamicro.com>
Reviewed-by: NGuo Ren <guoren@kernel.org>
Reviewed-by: NAtish Patra <atishp@rivosinc.com>
Signed-off-by: NPalmer Dabbelt <palmer@rivosinc.com>