cameraserver: Implement HIDL ICameraService skeleton.

Implement basic ICameraService HIDL functions, along with HIDL<=> AIDL
type conversions.

Bug: 110364143

Test: (build) mm -j64
Test: lshal->android.frameworks.cameraservice.service@2.0 shows up
Test: Sanity-> click pictures using GCA.

Change-Id: I44c2a96b1ccc05941d075e2bdeb94a8378d53c67
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>