fbset: the package doesn't use autotools at all

Previous attempt at fixing it (3649e6b5

) was
to replace inherit autotools with autotools-brokensep. But since the package
doesn't use autotools at all, there's no need to inherit either of those
classes.

Signed-off-by: Denys Dmytriyenko <denys@ti.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>