fix(ble-mesh): don't use dangling pointer in nimble gatt service (IDFGH-13203)

[mrsch]

Pointer to the uuid was used out of scope which resulted in errors when building with size optimization.

This fixes #12883

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[forx157]

Hi, @mrsch
Thanks for being patient while someone got back to you. This change LGTM, I've cherry-picked it into our review & merge queue. This PR will be updated when it's merged.

[Alvin1Zhang]

Thanks for contribution again, changes have been merged with be4278f.