x86: microcode: cosmetic changes

First announce ourself, then start working. Currently this module reports
itself when all is completed which is not most modules do. Plus some
cosmetic/whitespace cleanups.

Signed-off-by: Ben Castricum <lk0806@bencastricum.nl>
Cc: trivial@kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>