arm64: dts: ti: k3-am62x-phyboard-lyra-gpio-fan: Update cooling maps

arm64: dts: ti: k3-am62x-phyboard-lyra-gpio-fan: Update cooling maps

Rename 'main0_thermal_trip0' to a more descriptive name that
includes 'fan', as the current name is too generic for a fan control
trip point.

Move the fan to a new cooling map to avoid overwriting the passive
trip point used for CPU frequency throttling when this overlay is
enabled. Also, add the fan to the existing cooling map.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
Link: https://lore.kernel.org/r/20250506114134.3514899-2-d.schultz@phytec.de
Signed-off-by: Nishanth Menon <nm@ti.com>