Add IKE stub to main Android SDK

This CL is required for converting IKE from a shared library to
a jar in the boot classpath.

Bug: 177266501
Test: build, flash, boot
Change-Id: I10759d22eaba4861b7d7f283b551156f09f54675
Merged-In: I10759d22eaba4861b7d7f283b551156f09f54675