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Promote 586 w/ all common 686 features: Transmeta Crusoe, AMD Geode LX (except
long nop) to 686 for linux16 real-mode code path cpu feature validation. Just
do not generate the later. Ironically, since a looong time, mainline upstream
linux has NOPL disabled for all 32-bit builds anway, in kernel/cpu/common.c
detect_nopl() and most users boot via the new, non linux16 boot protocol anway.

static void detect_nopl(void)
{
#ifdef CONFIG_X86_32
        setup_clear_cpu_cap(X86_FEATURE_NOPL);

--- linux-6.8/arch/x86/boot/cpucheck.c.vanilla	2024-03-26 14:43:45.025312683 +0100
+++ linux-6.8/arch/x86/boot/cpucheck.c	2024-03-26 18:51:14.246564712 +0100
@@ -188,6 +190,16 @@
 	if (!err)
 		err = check_knl_erratum();
 
+	if (cpu.level < req_level) {
+#define USER686 ((1 << X86_FEATURE_TSC)|\
+		 (1 << X86_FEATURE_CX8)|\
+		 (1 << X86_FEATURE_CMOV))
+
+		if (cpu.level == 5 && (cpu.flags[0] & USER686) == USER686) {
+			cpu.level = 6;
+		}
+	}
+
 	if (err_flags_ptr)
 		*err_flags_ptr = err ? err_flags : NULL;
 	if (cpu_level_ptr)