cpuidle: riscv: support non-SMP config

Add <asm/smp.h> for cpuid_to_hartid_map etc.
This is needed for both SMP and non-SMP builds, but not having it
causes a build error for non-SMP:

drivers/cpuidle/cpuidle-riscv-sbi.c: In function 'sbi_cpuidle_init_cpu':
drivers/cpuidle/cpuidle-riscv-sbi.c:350:26: error: implicit declaration of function 'cpuid_to_hartid_map' [-Werror=implicit-function-declaration]

Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver")
Signed-off-by: Randy Dunlap <[e-mail]>
Reported-by: kernel test robot <[e-mail]>
Reviewed-by: Anup Patel <[e-mail]>
Signed-off-by: Palmer Dabbelt <[e-mail]>

drivers/cpuidle/cpuidle-riscv-sbi.c

···
 #include <linux/pm_runtime.h>
 #include <asm/cpuidle.h>
 #include <asm/sbi.h>
+#include <asm/smp.h>
 #include <asm/suspend.h>
 
 #include "dt_idle_states.h"