Add symbols when building the am625-phyboard-lyra-rdk DTB so
overlays can be applied.

Fixes: d8280f30 ("arm64: dts: ti: am62-phyboard-lyra: Add overlay to enable a GPIO fan")
Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
Link: https://lore.kernel.org/r/20240419193552.3090343-1-nmorrisson@phytec.comSigned-off-by: Nishanth Menon <nm@ti.com>