dt-bindings: arm: ti: Add bindings for PHYTEC AM68x based hardware

Add devicetree bindings for the AM68x based phyCORE-AM68x/TDA4x SoM
and the phyBOARD-Izar carrier board.

Signed-off-by: Dominik Haller <d.haller@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250423133635.29897-1-d.haller@phytec.de


Signed-off-by: Nishanth Menon <nm@ti.com>