powerpc/64s: Fix Power9 DD2.1 logic in DT CPU features

I got the logic wrong in the DT CPU features code when I added the
Power9 DD2.1 feature. We should be setting the bit if we detect a
DD2.1, not clearing it if we detect a DD2.0.

This code isn't actually exercised at the moment so nothing is
actually broken.

Fixes: 3ffa9d9e2a7c ("powerpc/64s: Fix Power9 DD2.0 workarounds by adding DD2.1 feature")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/dt_cpu_ftrs.c

@@ -735,8 +735,8 @@ static __init void cpufeatures_cpu_quirks(void)
 	 */
 	if ((version & 0xffffff00) == 0x004e0100)
 		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD1;
-	else if ((version & 0xffffefff) == 0x004e0200)
-		cur_cpu_spec->cpu_features &= ~CPU_FTR_POWER9_DD2_1;
+	else if ((version & 0xffffefff) == 0x004e0201)
+		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
 }
 
 static void __init cpufeatures_setup_finished(void)