systemd: Set RebootWatchdogSec to 60s as watchdog

The systemd-shutdown sets watchdog timeout to 10m (600 seconds) which is too
large, and caused errors when reboot on boars such as rpi4:

systemd-shutdown[1]: Failed to set timeout to 10min: Invalid argument

The watchog's default value is 60s, so set RebootWatchdogSec to 60s to fix the
errors. And <machin.conf> can set WATCHDOG_TIMEOUT when needed, for example,
the max timeout of rpi4 is 15 seconds.

(From OE-Core rev: 20a7ab9ff6ed777c6617a338d049ebe03fcc588c)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/systemd/systemd_250.5.bb

@@ -238,6 +238,9 @@ EXTRA_OEMESON += "-Dkexec-path=${sbindir}/kexec \
                   -Dnologin-path=${base_sbindir}/nologin \
                   -Dumount-path=${base_bindir}/umount"
 
+# The 60 seconds is watchdog's default vaule.
+WATCHDOG_TIMEOUT ??= "60"
+
 do_install() {
 	meson_do_install
 	install -d ${D}/${base_sbindir}
@@ -337,6 +340,11 @@ do_install() {
 
 	# add a profile fragment to disable systemd pager with busybox less
 	install -Dm 0644 ${WORKDIR}/systemd-pager.sh ${D}${sysconfdir}/profile.d/systemd-pager.sh
+
+    if [ -n "${WATCHDOG_TIMEOUT}" ]; then
+        sed -i -e 's/#RebootWatchdogSec=10min/RebootWatchdogSec=${WATCHDOG_TIMEOUT}/' \
+            ${D}/${sysconfdir}/systemd/system.conf
+    fi
 }
 
 python populate_packages:prepend (){

meta/recipes-extended/watchdog/watchdog-config.bb

@@ -13,8 +13,15 @@ SRC_URI = " \
     file://watchdog.conf \
 "
 
+# The default value is 60 seconds when null.
+WATCHDOG_TIMEOUT ??= ""
+
 do_install() {
     install -Dm 0644 ${WORKDIR}/watchdog.default ${D}${sysconfdir}/default/watchdog
     install -Dm 0644 ${WORKDIR}/watchdog.conf ${D}${sysconfdir}/watchdog.conf
+
+    if [ -n "${WATCHDOG_TIMEOUT}" ]; then
+        echo "watchdog-timeout = ${WATCHDOG_TIMEOUT}" >> ${D}/etc/watchdog.conf
+    fi
 }