MAINTAINERS: add entry for Kernel Selftest Framework

Add entry for Kernel Selftest Framework.  Individual tests continue to be
maintained by the maintainers for those areas.

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