arm64: dts: ti: k3-am62: New GPU binding details

Use the new compatible string and power domain name as introduced in
commit 2c01d909 ("dt-bindings: gpu: img: Future-proofing
enhancements").

Reviewed-by: Randolph Sapp <rs@ti.com>
Signed-off-by: Matt Coster <matt.coster@imgtec.com>
Link: https://lore.kernel.org/r/20250428-bxs-4-64-dts-v4-1-eddafb4ae19f@imgtec.com


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