Don't include the data dir in zygote library paths.

When creating a LoadedApk in a zygote context (app zygote or WebView
zygote), don't add the app's data dir to the list of paths the dynamic
linker is allowed to load libraries from, because the linker's attempt
to canonicalize the path causes SELinux access denials. The process
can't access the data directory at all, so cannot load libraries from
there in any case.

Fixes: 149481620
Test: check for avc denials from webview_zygote
Change-Id: I9aceecaf6067e748cc2251782b0f41661cbb35d8
(cherry picked from commit e1579d4d)