Add MITIGATE_SPECTRE_BRANCH_HISTORY for arm64

kconfig_hardened_check/__init__.py

@@ -375,6 +375,7 @@ def add_kconfig_checks(l, arch):
         l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_BTI_KERNEL', 'y')]
         l += [OR(KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_PREDICTOR', 'y'),
                  VersionCheck((5, 10)))] # HARDEN_BRANCH_PREDICTOR is enabled by default since v5.10
+        l += [KconfigCheck('self_protection', 'defconfig', 'MITIGATE_SPECTRE_BRANCH_HISTORY', 'y')]
         l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_MTE', 'y')]
     if arch == 'ARM':
         l += [KconfigCheck('self_protection', 'defconfig', 'CPU_SW_DOMAIN_PAN', 'y')]