linux-imx

docs: fix a couple of new broken references

Those are due to recent changes. Most of the issues
can be automatically fixed with:

	$ ./scripts/documentation-file-ref-check --fix

The only exception was the sound binding with required
manual work.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>