x86/smpboot: remove redundant CONFIG_SCHED_SMT

JIRA: https://issues.redhat.com/browse/RHEL-118964

commit 992de2b
Author: Li Chen <chenl311@chinatelecom.cn>
Date:   Thu Jul 10 18:57:08 2025 +0800

    x86/smpboot: remove redundant CONFIG_SCHED_SMT

    On x86 CONFIG_SCHED_SMT is default y if SMP is enabled, so let's
    simply drop CONFIG_SCHED_SMT.

    Suggested-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Li Chen <chenl311@chinatelecom.cn>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
    Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
    Link: https://lore.kernel.org/r/20250710105715.66594-3-me@linux.beauty

Signed-off-by: Phil Auld <pauld@redhat.com>

Author: auldp

arch/x86/kernel/smpboot.c

@@ -510,9 +510,7 @@ static void __init build_sched_topology(void)
 {
 	int i = 0;
 
-#ifdef CONFIG_SCHED_SMT
 	x86_topology[i++] = SDTL_INIT(cpu_smt_mask, cpu_smt_flags, SMT);
-#endif
 #ifdef CONFIG_SCHED_CLUSTER
 	x86_topology[i++] = SDTL_INIT(cpu_clustergroup_mask, x86_cluster_flags, CLS);
 #endif