[riot-notifications] [RIOT] cpu/cortexm_common: add used attributes for LTO (#4004)

[Sebastian]

@gebart samr21-xpro. But don't give too much since I'm building with an self-built gcc 5.2 and an unpatched newlib 2.1 right now and there is at least one patch for newlib I know of that seems to be LTO related.

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