MAINTAINERS: Move the BFQ io scheduler to Odd Fixes state

BFQ has been lacking active maintenance for approximately two years, and it
was recently transitioned to the Orphan state. However, there are still
many users, I have decided to step forward and assume the role of
maintainer to ensure continued support and development.

While I may not be the one with the most extensive knowledge of BFQ's
internals, I have been actively involved in its development since 2021.
Moreover, our team continues to rigorously test BFQ in downstream kernels,
ensuring it's stability and performance. Despite my confidence to maintain
BFQ, I believe it is prudent to classify its state as "Odd Fixes" to
accurately reflect my relatively new position as the maintainer.

By assuming this responsibility, I am committed to providing the necessary
support and addressing any issues that may arise with BFQ. As time
progresses, we will reassess the situation and determine the appropriate
state.

Signed-off-by: Yu Kuai <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jens Axboe <[e-mail]>

MAINTAINERS

···
 F:	fs/befs/
 
 BFQ I/O SCHEDULER
+M:	Yu Kuai <[e-mail]>
 L:	[e-mail]
-S:	Orphan
+S:	Odd Fixes
 F:	Documentation/block/bfq-iosched.rst
 F:	block/bfq-*