Pass the correct user ID to SetProcessProfilesCached()

SetProcessProfilesCached() can only set cgroup attributes in the v2
cgroup hierarchy if it is passed the correct user ID. Hence this CL.
This CL makes SetProcessProfilesCached() apply IO controller cgroup
attributes for processes with a user ID that is not zero.

Bug: 320456702
Bug: 213617178
Change-Id: I84d072c14ff01422560c241a69cb9f4e02c47e74
Signed-off-by: Bart Van Assche <bvanassche@google.com>