arm64: dts: ti: iot2050: Annotate LED nodes

Add function and color properties and use the common scheme for the node
name. We can't change the user-visible labels, though, due to existing
userspace relying on the current format.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Link: https://lore.kernel.org/r/331f8756483e3f896a3e50e069b3e2c0fae7a8ac.1707463401.git.jan.kiszka@siemens.com


Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>