ARM: dts: ux500: Fix missing node renames

I renamed the dsi-nodes from dsi@ to dsi-controller@
so that the schema check would kick in, but missed to
rename it in a few places.

Link: https://lore.kernel.org/r/20200326222536.86441-1-linus.walleij@linaro.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>