drm: 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: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200416103058.15269-4-geert+renesas@glider.be