Use bool value in set_cpu_online()

The declaration of set_cpu_online() takes a bool value. So replace
int here to make it consistent with the declaration.
Signed-off-by: Zhao Ke <ke.zhao@shingroup.cn>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20240318065404.123668-1-ke.zhao@shingroup.cnSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/kernel/smpboot.c

@@ -224,7 +224,7 @@ asmlinkage __visible void smp_callin(void)
 	riscv_ipi_enable();
 
 	numa_add_cpu(curr_cpuid);
-	set_cpu_online(curr_cpuid, 1);
+	set_cpu_online(curr_cpuid, true);
 
 	if (has_vector()) {
 		if (riscv_v_setup_vsize())