Don't ignore encryption change events while in IDLE state

If we hit an LMP timeout, we may have pending security operations while
in the IDLE state. If we then get an encryption change event while in
IDLE, we should handle it, as otherwise these security operations will
be unhandled.

Test: manual
Bug: 267672620
(cherry picked from https://android-review.googlesource.com/q/commit:ddb86a183f311f8f6f82178d011a18fe2d2cc1b1)
Merged-In: I61c6eb5bd72ba6c3dac1186de1b893e5b461e368
Change-Id: I61c6eb5bd72ba6c3dac1186de1b893e5b461e368
Bug: 263323082