x86/cpu: Enable SD_ASYM_PACKING for PKG domain on AMD

Enable the SD_ASYM_PACKING domain flag for the PKG domain on AMD heterogeneous
processors.  This flag is beneficial for processors with one or more CCDs and
relies on x86_sched_itmt_flags().

Signed-off-by: Perry Yuan <[email protected]>
Co-developed-by: Mario Limonciello <[email protected]>
Signed-off-by: Mario Limonciello <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Gautham R. Shenoy <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Perry Yuan

arch/x86/kernel/smpboot.c

@@ -497,8 +497,9 @@ static int x86_cluster_flags(void)
 
 static int x86_die_flags(void)
 {
-	if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
-	       return x86_sched_itmt_flags();
+	if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU) ||
+	    cpu_feature_enabled(X86_FEATURE_AMD_HETEROGENEOUS_CORES))
+		return x86_sched_itmt_flags();
 
 	return 0;
 }