Update includes to to be relative to src directory

Don't use relative imports like `../foo.h` as those depend on the
relative position of both files. Rather than that use imports relative
to the `src` directory, which explicitly is part of the include
directories.

src/components/ble/ServiceDiscovery.cpp

@@ -1,6 +1,6 @@
-#include "ServiceDiscovery.h"
+#include "components/ble/ServiceDiscovery.h"
 #include <libraries/log/nrf_log.h>
-#include "BleClient.h"
+#include "components/ble/BleClient.h"
 
 using namespace Pinetime::Controllers;