[riot-notifications] [RIOT-OS/RIOT] drivers/at24mac: fix dependency (#15449)

[benpicco]

`at24c%` pulls in `at24cxxx` so it makes sense that the user should never have to manually include `at24cxxx`.
In that sense having the dependency for `at24mac` is consistent - and any application that uses MAC addresses will also use xtimer.

I think this can be closed. 

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