ARM: dts: ti: Drop unused .dtsi

These .dtsi files are not included anywhere in the tree and can't be
tested.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251212203226.458694-6-robh@kernel.org
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Author: robherring