systemd: added custom sysctl configuration

Signed-off-by: Karel Hanák <karel.hanak@iqrf.org>

recipes-core/systemd/files/50-iqrf.conf

+kernel.panic_on_rcu_stall=1
+kernel.panic=20
\ No newline at end of file

recipes-core/systemd/systemd_%.bbappend

@@ -3,6 +3,7 @@ FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
 SRC_URI_append = " \
 	file://init.sh \
 	file://0001-Move-localtime-to-data-partition.patch \
+	file://50-iqrf.conf \
 "
 
 do_install_append() {
@@ -14,6 +15,8 @@ do_install_append() {
 
 	# systemd services should have read-write permission to /etc and /data/etc
 	sed -i -e "s#\(^ReadWritePaths=.*\)#\1 /data/etc#" ${D}${systemd_unitdir}/system/systemd-timedated.service
+
+	install -m 600 ${WORKDIR}/50-iqrf.conf ${D}${sysconfdir}/sysctl.d
 }
 
 FILES_${PN} += "${sbindir}/*"