arm: dts: meson: remove meson-a1.dtsi

arm: dts: meson: remove meson-a1.dtsi

For Amlogic A1, we have to use dtsi from dts/upstream folder.
The only difference between this two files is the added cpu temperature
node definition in upstream version and additional assigned-clock for
USB. This patch is tested on a device with A113L SoC (AD401-like) and
everything is okay.

So, we can remove legacy arch/arm/dts/meson-a1.dtsi file.

Signed-off-by: Alexey Romanov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Neil Armstrong <[email protected]>