Remove sandbox specific bind mounts from root namespace.

Update vold to only create package sandboxes and not do any bind mounts.
After zygote forks, all the necessary bind mounts will be setup for
the process.

Bug: 124009234
Test: manual
Test: atest cts/hostsidetests/appsecurity/src/android/appsecurity/cts/ExternalStorageHostTest.java
Test: atest DownloadProviderTests
Test: atest cts/tests/app/src/android/app/cts/DownloadManagerTest.java
Test: atest MediaProviderTests
Test: atest cts/tests/tests/provider/src/android/provider/cts/MediaStore*

Change-Id: Ibd4af79b385e20228a0e9ce4446f14ead87e228e