dt-bindings: More cleanup of standard unit properties

Properties with standard unit suffixes already have a type and don't need
type references. Fix a few more cases which have gotten added.

Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Kevin Tsai <ktsai@capellamicro.com>
Cc: linux-iio@vger.kernel.org
Cc: linux-input@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Dmity Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Acked-by: Sebastian Reichel <sre@kernel.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/20210316194824.3526913-1-robh@kernel.org