MAINTAINERS: add linux-api for review of API/ABI changes

MAINTAINERS: add linux-api for review of API/ABI changes

This makes it more likely that patch submitters will CC API/ABI changes to
the linux-api list, and tools like get_maintainer.pl will do so
automatically.

Signed-off-by: Josh Triplett <[email protected]>
Acked-by: Steven Rostedt <[email protected]>
Acked-by: Michael Kerrisk <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>