Revert "Let signapk access internal APIs under OpenJDK 9 toolchain"

This reverts commit 9cc3c76a which
added command-line parameters to the invocation of SignApk to permit
it to access sun.** classes which are not accessible by default in
Java 9. This hack is no longer needed because SignApk no longer needs
this access because of tools/apksig commit
b40d3e4821bc9cb094b0ff13153340e3a0da1b3f which switched APK JAR
signature generation logic away from directly using sun.** classes.

Test: find out -name CtsPkgInstallTinyApp* | xargs rm -Rf
      mmma -j74 cts/hostsidetests/appsecurity/test-apps/tinyapp
Test: find out -name CtsPkgInstallTinyApp* | xargs rm -Rf
      EXPERIMENTAL_USE_OPENJDK9=target1.8 \
        OVERRIDE_ANDROID_JAVA_HOME=<path to Java 9 SDK> \
        PATH=${OVERRIDE_ANDROID_JAVA_HOME}/bin:${PATH} \
        mmma -j74 cts/hostsidetests/appsecurity/test-apps/tinyapp
Bug: 37137869
Change-Id: I389c366f8a5bed56c496293bc871458adbedb0e8