Handle prebuilt module types in allInstalledModules

Owner in PackagingSpec uses ModuleName, while allInstalledModules uses
mod.Name(). For prebuilt modules without any sources (e.g.
com.android.apex.cts.shim.v1_prebuilt), the former does not contain
prebuilt_, but the latter does contain it. This was causing such modules
to be skipped in the results of allInstalledModules.

This CL fixes it by using ctx.OtherModuleName

Test: verified that com.android.apex.cts.shim.v1_prebuilt is returned by
allInstalledModules of aosp_cf_x86_64_phone

Change-Id: Id87e8cf782a94c48245385c1837960eee803c619