frameworks/base: move the traces file to avoid data loss.

If an ANR comes just after the framework reboot, the traces for
the framework reboot will get over-written with the ANR traces.
So, We are missing the traces for the framework reboot which
makes debugging the framework reboot difficult.

This patch will rename this trace file for the framework reboot
once the ActivityManager collects the traces.

Change-Id: Iee07b13ba02d8aab9cc43567aa5df131cc43c737
(cherry picked from commit 93348d7b1f48f1b3f6759bcff73153dce5709ded)
(cherry picked from commit 1c7cad9ce8b66eebe556c76c01a9396d449411cf)