meta-bletchley: systemd: increase RuntimeWatchdogSec

We notice that systemd cost long time to start after firmware update,
and it can exceed 30s timeout.
Increase the watchdog timeout to 90s to avoid BMC reset after firmware
update.

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I43efde51c2465c40753400795e60a7edd1a5ea26
diff --git a/meta-facebook/recipes-core/systemd/systemd/40-system.conf b/meta-facebook/recipes-core/systemd/systemd/40-system.conf
index 10862b6..2e8ebda 100644
--- a/meta-facebook/recipes-core/systemd/systemd/40-system.conf
+++ b/meta-facebook/recipes-core/systemd/systemd/40-system.conf
@@ -1,3 +1,3 @@
 [Manager]
-RuntimeWatchdogSec=30s
+RuntimeWatchdogSec=90s
 WatchdogDevice=/dev/watchdog