Don't package host cross modules in javaFuzzPackager

Normally the host cross OS is windows, which only builds a few opted-in
modules.  When the host cross OS is set to linux_musl it builds all
modules that haven't explicitly opted out, producing linux_musl_common
variants of java modules.  Filter these out of javaFuzzPackager to
avoid conflicts with the linux_glibc_common modules.

Host cross common variants targets were missing the HostCross flag,
so also set it in getCommonTargets.

Bug: 236052820
Test: builds with linux_musl arm64 host cross enabled
Change-Id: I58c846076091bee7df50016c240a176c039c42e9