Add a nice install paths for module SDKs and exports.

Following how NDK also creates its own install path.

Bug: 142935992
Bug: 153306490
Test: cc_sdk_test.go, java_sdk_test.go
Merged-In: I98a3656903f37f6d7c90e6cf609431b2461a6161
Change-Id: I98a3656903f37f6d7c90e6cf609431b2461a6161