x86/mce: Check for alternate indication of machine check recovery on Skylake

Currently we just check the "CAPID0" register to see whether the CPU
can recover from machine checks.

But there are also some special SKUs which do not have all advanced
RAS features, but do enable machine check recovery for use with NVDIMMs.

Add a check for any of bits {8:5} in the "CAPID5" register (each
reports some NVDIMM mode available, if any of them are set, then
the system supports memory machine check recovery).

Signed-off-by: Tony Luck <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Qiuxu Zhuo <[email protected]>
Cc: Ashok Raj <[email protected]>
Cc: [email protected] # 4.9
Cc: Dan Williams <[email protected]>
Cc: Borislav Petkov <[email protected]>
Link: https://lkml.kernel.org/r/03cbed6e99ddafb51c2eadf9a3b7c8d7a0cc204e.1527283897.git.tony.luck@intel.com

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