MAINTAINERS: update microcode patterns

Commit bad5fa631fca ("x86, microcode: Move to a proper location") moved
the files, update the pattern.

Signed-off-by: Joe Perches <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed