Add flag to toggle IRK rotation

Based on discussion in linked bug, to prevent further regressions if the
latest fixes are still incomplete.

Bug: 195410559
Test: compiles
Ignore-AOSP-First: security
Change-Id: I1741929c639f2dbc6417974bf3287d8d141e33df
(cherry picked from commit 924c3a96)
Merged-In: I1741929c639f2dbc6417974bf3287d8d141e33df