Send cached target duration when creating sessions

This fixes an issue where the default target duration was being sent
when re-creating sessions, after the true target duration was already
known. This caused the wrong value in PowerHAL, and no corrective update
was sent because the cached value never changed.

Bug: 301806277
Test: hwuitest
Change-Id: I80d90e855fce92264d8341aad78b19dc547b65f4
Merged-In: I80d90e855fce92264d8341aad78b19dc547b65f4