Since the slot is M.2 Key-M to which mostly NVMe devices are connected directly (although other types of devices are connected through adapter cars) and having WAKE is of little use for NVMe devices, it is not populated in the DT.
FWIW, if it is an M.2 Key-E slot, then, mostly WiFi devices get connected to it and it makes sense to have WAKE configured for that as WOL (Wake On Lan) and WoW (Wake On Wireless) are generally used.
If you have a use case for WAKE in M.2 Key-M, please populate it in the DT.
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