EDAC, mce_amd_inj: Read out number of MCE banks from the hardware

EDAC, mce_amd_inj: Read out number of MCE banks from the hardware

The number of banks for a given processor is encoded in
MSR_IA32_MCG_CAP[7:0]. So obtain the value from that MSR and use it for
sanity checking in inj_bank_set() instead of doing a family/model check.

Signed-off-by: Aravind Gopalakrishnan <[email protected]>
Cc: linux-edac <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Borislav Petkov <[email protected]>