dt-bindings: soc: mediatek: mutex: Improve title and description

Improve both the title and the description of this hardware to
disambiguate its functionality from a hardware mutex and/or from
a hwspinlock.

Though in datasheets this is called "DISP_MUTEX", the meaning is
is "Mute-X" (where "X" means "any hardware trigger signal") really
as this is what this piece of hardware does: muting or unmuting of
signals in each sub-IP of the display or other multimedia related
controllers.

Based on that, also clarify the description text, as to make sure
that the information is actually accurate.

While at it, also avoid forcing literal blocks in the description
as there is nothing in there needing that (no ascii graph or other
stuff that needs a literal block anyway), and add myself in the
list of maintainers.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

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