Fix enumerate corner case

Do not post reset runnable when another client is requested while
cleanup is happening. The runnable will be "pending" and started once
cleanup finishes instead.

Fixes: 129534163

Test: Based on logs in the bug, this is reasonable
Test: reboot device, fingerprint still works
Change-Id: I766cc04be151abaae60a0092f71fd7a3acf3397a
Merged-In: I766cc04be151abaae60a0092f71fd7a3acf3397a
(cherry picked from commit ea80d17c)