cmake: remove BUILD type in function description.

Build type was removed in 763a49f082171499442eed6b617f78f33c4e42a5 but
the function description was not updated accordingly.

Remove build type from the function description.

Add board qualifier as that is missing.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
1 file changed