arm64: dts: ti: Enable overlays for the am625-phyboard-lyra

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>

arch/arm64/boot/dts/ti/Makefile

@@ -172,6 +172,7 @@ dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
 
 # Enable support for device-tree overlays
 DTC_FLAGS_k3-am625-beagleplay += -@
+DTC_FLAGS_k3-am625-phyboard-lyra-rdk += -@
 DTC_FLAGS_k3-am625-sk += -@
 DTC_FLAGS_k3-am62-lp-sk += -@
 DTC_FLAGS_k3-am62a7-sk += -@