ARM: dts: vt8500: Fix the unit address of the VT8500 LCD controller

ARM: dts: vt8500: Fix the unit address of the VT8500 LCD controller

Set correct unit address of d800e400 for the via,vt8500-fb node
in vt8500.dtsi. Note that the reg property contained a correct
address, so it must have been a copy and paste error earlier.

While here, also update its node name to a generic one.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Link: https://lore.kernel.org/r/20250515-wmt-dts-updates-v2-4-246937484cc8@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>