dt-bindings: Fix misspellings of "Analog Devices"

According to https://www.analog.com/, the company name is spelled
"Analog Devices".
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/display/bridge/adi,adv7123.txt

-Analog Device ADV7123 Video DAC
--------------------------------
+Analog Devices ADV7123 Video DAC
+--------------------------------
 
 The ADV7123 is a digital-to-analog converter that outputs VGA signals from a
 parallel video input.

Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt

-Analog Device ADV7511(W)/13/33/35 HDMI Encoders
------------------------------------------
+Analog Devices ADV7511(W)/13/33/35 HDMI Encoders
+------------------------------------------------
 
 The ADV7511, ADV7511W, ADV7513, ADV7533 and ADV7535 are HDMI audio and video
 transmitters compatible with HDMI 1.4 and DVI 1.0. They support color space

Documentation/devicetree/bindings/dma/adi,axi-dmac.txt

-Analog Device AXI-DMAC DMA controller
+Analog Devices AXI-DMAC DMA controller
 
 Required properties:
  - compatible: Must be "adi,axi-dmac-1.00.a".

Documentation/devicetree/bindings/iio/dac/ad5755.txt

-* Analog Device AD5755 IIO Multi-Channel DAC Linux Driver
+* Analog Devices AD5755 IIO Multi-Channel DAC Linux Driver
 
 Required properties:
  - compatible: Has to contain one of the following: