sensors: Align source structure away from anti-patterns

The anti-patterns document comments on source structure, specifically
on placing internal headers in a parallel subtree[1]. dbus-sensors is an
example of violating this anti-pattern, so fix it.

[1]: https://github.com/openbmc/docs/blob/master/anti-patterns.md#placing-internal-headers-in-a-parallel-subtree

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I50ecaddd53fa9c9b7a0441af9de5e60bd94e47c6
diff --git a/src/PwmSensor.cpp b/src/PwmSensor.cpp
index 0ee8c88..ad54dfe 100644
--- a/src/PwmSensor.cpp
+++ b/src/PwmSensor.cpp
@@ -13,8 +13,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
-#include <PwmSensor.hpp>
-#include <Utils.hpp>
+
+#include "PwmSensor.hpp"
+
+#include "Utils.hpp"
+
 #include <sdbusplus/asio/object_server.hpp>
 
 #include <fstream>