Without this change, gen-kotlin-build-file.sh will generate
kotlinc-build.xml file with path that look like:
/path/to/aosp-top//path/to/aosp-out/soong/.intermediates/...
Also fixed a couple lint errors.
Test: Set OUT_DIR_COMMON_BASE and was able to build
Bug: 111309264
Change-Id: I86173571667deca79ee0d9a7324715c9a0e4cd97