Revert "x86/cpu/AMD: Fix erratum 1076 (CPB bit)"

BugLink: https://bugs.launchpad.net/bugs/1791080

This reverts commit 21e1e57b to
be replaced by upstream stable variant.
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/x86/kernel/cpu/amd.c

@@ -814,15 +814,6 @@ static void init_amd(struct cpuinfo_x86 *c)
 	if (cpu_has_amd_erratum(c, amd_erratum_400))
 		set_cpu_bug(c, X86_BUG_AMD_APIC_C1E);
 
-	if (c->x86 == 0x17) {
-		/*
-		 * Fix erratum 1076: CPB feature bit not being set in CPUID.
-		 * It affects all up to and including B1.
-		 */
-		if (c->x86_model <= 1 && c->x86_mask <= 1)
-			set_cpu_cap(c, X86_FEATURE_CPB);
-	}
-
 	rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
 
 	/* 3DNow or LM implies PREFETCHW */