ARM: drop pointless SMP check on secondary startup path

Only SMP systems use the secondary startup path by definition, so there
is no need for SMP conditionals there.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

arch/arm/kernel/smp.c

@@ -405,11 +405,6 @@ static void smp_store_cpu_info(unsigned int cpuid)
 
 static void set_current(struct task_struct *cur)
 {
-	if (!IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO) && !is_smp()) {
-		__current = cur;
-		return;
-	}
-
 	/* Set TPIDRURO */
 	asm("mcr p15, 0, %0, c13, c0, 3" :: "r"(cur) : "memory");
 }