meta-google: Increase hardware watchdog timeout to 60s

When running an image with a certain version of QEMU, the emulated BMC
may enter bootloop due to the Watchdog not getting petted for more than
10s.

One can check this by monitoring
s->tim[1]->watchdog_timer.base_timer.expires_ns in QEMU (where s may be
an NPCM7xxState or similar hardware state object).

Reverting the timeout to 60s seems to resolve the issue with QEMU usage.

Signed-off-by: Sui Chen <suichen@google.com>
Change-Id: I29313ff67415003d5f82f0f8a5cc1703b34fb2c0
diff --git a/meta-google/recipes-google/systemd/files/40-system.conf b/meta-google/recipes-google/systemd/files/40-system.conf
index 5f770d0..601e0a5 100644
--- a/meta-google/recipes-google/systemd/files/40-system.conf
+++ b/meta-google/recipes-google/systemd/files/40-system.conf
@@ -1,4 +1,4 @@
 [Manager]
 DefaultMemoryAccounting=yes
-RuntimeWatchdogSec=10s
+RuntimeWatchdogSec=60s
 WatchdogDevice=/dev/watchdog