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/PSUSensor.cpp b/src/PSUSensor.cpp
index 6e2934f..986fe59 100644
--- a/src/PSUSensor.cpp
+++ b/src/PSUSensor.cpp
@@ -14,9 +14,10 @@
 // limitations under the License.
 */
 
+#include "PSUSensor.hpp"
+
 #include <unistd.h>
 
-#include <PSUSensor.hpp>
 #include <boost/asio/random_access_file.hpp>
 #include <boost/asio/read_until.hpp>
 #include <sdbusplus/asio/connection.hpp>