Include luna-service2 from correct location

:Release Notes:
PmLogDaemon compiles correctly in a standalone Ubuntu build.

:Detailed Notes:
LS2 header files are stored under the luna-service2 folder. This is
often in the include path in an OE build, but never in a standalone
command line build.

:Testing Performed:
Clean compile. No image change

:QA Notes:

:Issues Addressed:
None - Fixed in passing

Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@lge.com>

Change-Id: Iffb3aff228c65907e794f9dc2713ed10a7e63245
Reviewed-on: https://g2g.palm.com/3296
Reviewed-by: Build Verification
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Tested-by: Keith Derrick <keith.derrick@lge.com>
Reviewed-by: Hongjeon Ha <hj.ha@lge.com>