AFDOGenerate is failing again. Need more time to fix it.

Revert "Revert "AFDO: Increase the expiration days of old AFDO data.""

This reverts commit 4ca44bbe26e2dc51b8a3f43efff9b556138de128.

Change-Id: I0513263a0875afc217868822798c132c30c564a0
Reviewed-on: https://chromium-review.googlesource.com/381692
Commit-Queue: Ting-Yuan Huang <laszio@chromium.org>
Tested-by: Ting-Yuan Huang <laszio@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>
diff --git a/cbuildbot/afdo.py b/cbuildbot/afdo.py
index 27008d9..4ed59c5 100644
--- a/cbuildbot/afdo.py
+++ b/cbuildbot/afdo.py
@@ -53,7 +53,7 @@
 CHROME_EBUILD_AFDO_REPL = r'\g<bef>%s\g<aft>'
 
 # How old can the AFDO data be? (in days).
-AFDO_ALLOWED_STALE = 7
+AFDO_ALLOWED_STALE = 14
 
 # Set of boards that can generate the AFDO profile (can generate 'perf'
 # data with LBR events). Currently, it needs to be a device that has