fix/module: Add error messages to `static_assert` statements
This patch adds an error message to static_assert
statements that
checks structure definitions mapped to real registers.
The LLVM compiler requires these error messages to be present.
Signed-off-by: Leandro Belli leandro.belli@arm.com Change-Id: Iad80357bbc5a788e83cc07389be932f0c92d0bbc