x86/mce: Add a wrapper around mce_log() for injection

Will be used by an injector module in a following patch.

Additionally, add a missing module export reported by 0-DAY kernel test.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/201508112002.zlZNJHPH%fengguang.wu@intel.com
2 files changed