Allow multiuser use of keystore

Since keystore has been refactored to let muliple users use it
simultaneously, we can remove all the restrictions put into place to
prevent it.

(cherry picked from commit 89f8f9ab58947ba67f95c5784dc4288bf78a2fdf)

Bug: 7249554
Change-Id: I05e8804e35d762ad473d1649fdba34e4182a2c68
1 file changed