Set sysctl values in initramfs

etc/initramfs-tools/scripts/init-bottom/sysctl-initramfs

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+## Copyright (C) 2012 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
+## See the file COPYING for copying conditions.
+
+PREREQ=""
+prereqs()
+{
+        echo "$PREREQ"
+}
+case $1 in
+prereqs)
+        prereqs
+        exit 0
+        ;;
+esac
+
+sysctl -p ${rootmnt}/etc/sysctl.d/*.conf