x86/speculation/spectre_v2: Exclude Zhaoxin CPUs from SPECTRE_V2

commit 1e41a766 upstream.

New Zhaoxin family 7 CPUs are not affected by SPECTRE_V2. So define a
separate cpu_vuln_whitelist bit NO_SPECTRE_V2 and add these CPUs to the cpu
vulnerability whitelist.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/1579227872-26972-2-git-send-email-TonyWWang-oc@zhaoxin.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>