cpu/arm: fixes necessary for toolchain upgrade [backport 2020.01]#13536
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aabadie merged 3 commits intoRIOT-OS:2020.01-branchfrom Mar 3, 2020
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benpicco
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Mar 3, 2020
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Backport of #13456
Contribution description
The ARM toolchain upgrade (RIOT-OS/riotdocker#78) slipped through some new compiler warnings (which turn into errors now).
This PR tries to fix them.
Testing procedure
Issues/PRs references
Fixes #13434.