examples/lis3dh-fifo: code style conventions.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
examples/lis3dh-poll: code style conventions.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
platform/mulle/lis3dh: Code style conventions.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>