ARM64/errata: Ensure vulnerable CPUs are actually flagged on is_spectrev2_safe()

This updates logic introduced by commit 0d2ce644 to ensure affected CPUs
are properly flagged as affected by Spectre BHB, either by SMCCC or PSCI
methods of detection.

Signed-off-by: Albert I <kras@raphielgang.org>
[jjpprrrr: change !(A || B) to (!B && !A) to take advantage of short
circuit when B (PSCI) is the more likely case]
Signed-off-by: Chenyang Zhong <zhongcy95@gmail.com>
Change-Id: I1da47886c5e1f1331ece977813ae3ec832d13af3

arch/arm64/kernel/cpu_errata.c

@@ -886,9 +886,9 @@ static bool is_spectrev2_safe(void)
 	};
 
 	return !is_midr_in_range_list(read_cpuid_id(),
-	                              arm64_bp_harden_smccc_cpus) ||
+				      arm64_psci_bp_harden_cpus) &&
 			!is_midr_in_range_list(read_cpuid_id(),
-			                       arm64_psci_bp_harden_cpus);
+				               arm64_bp_harden_smccc_cpus);
 }
 
 void spectre_bhb_enable_mitigation(const struct arm64_cpu_capabilities *entry)