MAINTAINERS: Add printk indexing maintainers on mention of printk_index

This will primarily catch new and changed printk_index_subsys_emit
calls, but it's also worth catching changes to other printk indexing
infrastructure outside of kernel/printk/index.c.

This avoids churn due to missing ccs when adding new printk indexes, as
was the case recently for the first round of the XFS printk indexing
patches.

Signed-off-by: Chris Down <[email protected]>
Cc: Petr Mladek <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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