Installd: restorecon mislabeled gsf

This is a temporary fix while we determine a better long term fix.
This will recursively fix up the selinux context of
/data/user/0/com.google.android.gsf.

Bug: 188141923
Bug: 190567190
Test: 1. adb root
2. adb shell cp /system/build.prop /user/data/0/com.google.android.gsf
3. adb reboot
4. adb root; adb shell ls -laZ /user/data/0/com.google.android.gsf
5. verify that installd has fixed up incorrect labels.

Change-Id: Ieadd64b61162f2fa802add2a8e54d2072ad2fd48