add target_compatible_with stanza for host targets

Soong modules that are specific for the host platform (e.g.
java_library_host, cc_binary_host, java_genrule_host, etc.) should
not be built on the target platform (Android), so we add a
target_compatible_with attribute to skip this type of module on an
Android target build.

Bug: 215229742
Test: go test ./bp2build
Change-Id: Ifb76ef4e0dc4cb3adb6a64b5c375ce36f7973e48