dt-bindings: More whitespace clean-ups in schema files

Clean-up incorrect indentation, extra spaces, and missing EOF newline in
schema files. Most of the clean-ups are for list indentation which
should always be 2 spaces more than the preceding keyword.

Found with yamllint (now integrated into the checks).

Cc: linux-arm-kernel@lists.infradead.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-gpio@vger.kernel.org
Cc: linux-i2c@vger.kernel.org
Cc: linux-iio@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Cc: alsa-devel@alsa-project.org
Cc: linux-mmc@vger.kernel.org
Cc: linux-mtd@lists.infradead.org
Cc: linux-serial@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C
Acked-by: Sam Ravnborg <sam@ravnborg.org> # for display
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> #for-iio
Signed-off-by: Rob Herring <robh@kernel.org>

dt-bindings: mfd: Add bindings for sl28cpld

Add a device tree bindings for the board management controller found on
the Kontron SMARC-sAL28 board.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>