dt-bindings: Fix inconsistent quoting

dt-bindings: Fix inconsistent quoting

yamllint has gained a new check which checks for inconsistent quoting
(mixed " and ' quotes within a file). Fix all the cases yamllint found
so we can enable the check (once the check is in a release). As single
quotes are (slightly) preferred, use them throughout the modified files
even if double quotes are mostly used.

Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Lee Jones <lee@kernel.org>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://patch.msgid.link/20251015232015.846282-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>