Fix build break for Android.bp dex_import

Error message is:
'out/target/common/obj/JAVA_LIBRARIES/x_intermediates/classes.jar',
needed by 'out/target/common/obj/JAVA_LIBRARIES/x_intermediates/jav
alib.jar', missing and no known rule to make it;

Soong Android.mk generated does not define LOCAL_SOONG_CLASSES_JAR
or LOCAL_SOONG_HEADER_JAR. So don't add them to javalib.jar's
dependencies.

Bug: 144664536
Change-Id: I6b530d40c859c6484425b8ec37c0fa7112a21346