maintainers: Update freedesktop.org IRC channels

Like many free software projects, freedesktop.org issued a non-binding
recommendation for projects to migrate from Freenode to OFTC [1]. As
such, freedesktop.org entries in the MAINTAINERS file are out-of-date as
the respective channels have moved. Update the file to point to the
right network.

v2: Correct typo in commit message pointed out by Lukas and Jonathan.
Add Hector's ack.

v3: Add acks.

[1] https://lists.freedesktop.org/archives/dri-devel/2021-May/307605.html

Signed-off-by: Alyssa Rosenzweig <[email protected]>
Acked-by: Hector Martin <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Cc: Karol Herbst <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Lukas Wunner <[email protected]>
Cc: Jonathan Neuschäfer <[email protected]>
Cc: [email protected]
Signed-off-by: Karol Herbst <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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