Add OverlayManagerImpl to create frro, idmap and get overlayInfos

Add OverlayManagerImpl to let applications create frro and idmap files
for overlaying itself's android resources.
* OverlayManagerImpl.java
  * check the FabricatedOverlayInternal.
* com_android_internal_content_om_OverlayManagerImpl.cpp
  * convert and read Java objects to native data.
  * call the APIs in libidmap2 to create frro and idmap files.

Add OverlayManagerImpl.cpp into AndroidRuntime by modifying Android.bp
* Add register_com_android_internal_content_om_OverlayManagerImpl
  register JNI methods
* add com_android_internal_content_om_OverlayManagerImpl.cpp
    * It's a adapter to delegate the tasks to SelfTargeting.cpp
    * dynamic link with libidmap2 by using dlopen and dlsym to call
      functions in libidmap2.

Add SelfTargeting.cpp into libidmap2
* createFrroFile
* createIdmapFile
* getFabricatedOverlayInfo

for interoperability between libandroid_runtime and libidmap2.
* move OverlayManifestInfo from libidmap2 to libandroidfw
* add FabricatedOverlayEntryParameters into libandroidfw

Bug: 205919743

Test: build
Test: atest \
                  OverlayHostTests \
                  OverlayDeviceTests \
                  SelfTargetingOverlayDeviceTests \
                  OverlayRemountedTest \
                  FrameworksServicesTests:com.android.server.om \
                  CtsContentTestCases:android.content.om.cts \
                  idmap2_tests

Change-Id: I5425f3229e9a3858e57427ef84e6abaf32e89b6e