x86, MCE, AMD: Use macros to compute bank MSRs

Avoid open coded calculations for bank MSRs by hiding the index
of higher bank MSRs in well-defined macros.

No semantic changes.

Signed-off-by: Chen Yucong <slaoub@gmail.com>
Link: http://lkml.kernel.org/r/1411438561-24319-1-git-send-email-slaoub@gmail.com


Signed-off-by: Borislav Petkov <bp@suse.de>