x86/mce: Add macros for the corrected error count bit field

x86/mce: Add macros for the corrected error count bit field

The bit field [52:38] of MCi_STATUS contains the corrected error count.
Add {*_SHIFT|*_MASK|*_CEC(c)} macros for it.

 [ bp: use GENMASK_ULL. ]

Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Aristeu Rozanski <aris@redhat.com>
Cc: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: linux-edac@vger.kernel.org
Cc: x86@kernel.org
Link: https://lkml.kernel.org/r/20180925000343.GB5998@agluck-desk