for armv8.5 speculative store bypass PSTATE bit support, added in linux commit d71be2b6c0e19180b5f80a6d42039cc074a693a2
@@ -26,3 +26,4 @@
#define HWCAP_USCAT (1 << 25)
#define HWCAP_ILRCPC (1 << 26)
#define HWCAP_FLAGM (1 << 27)
+#define HWCAP_SSBS (1 << 28)