Include config.h for strict-failsafe-pwm option

The strict-failsafe-pwm meson option definition was not be seeing by
the #ifdefs since the config.h that meson creates that defines the
option is not included. The strict-failsafe-pwm option can now be
enabled by adding EXTRA_OEMESON:append = " -Dstrict-failsafe-pwm=true"
to the bbappend.

Change-Id: Ic4047bcd0e4599d14ab84744ffe22d23faa994dd
Signed-off-by: Jonico Eustaquio <jonico.eustaquio@fii-na.com>
diff --git a/pid/fancontroller.cpp b/pid/fancontroller.cpp
index b0591b5..68c4f68 100644
--- a/pid/fancontroller.cpp
+++ b/pid/fancontroller.cpp
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#include "config.h"
 
 #include "config.h"