fix(kernel-modules): add sysctl to initramfs to handle modprobe files

Users were seeing errors like this:

[     2.917246] dracut-pre-udev[717]: sh: line 1: /sbin/sysctl: No such file or directory

This was the result of modprobe.d files that needed to call sysctl
and failing because sysctl wasn't included in the initramfs.

This change makes it so that we have the binary included so those
modprobe configuration files work properly.

modules.d/90kernel-modules/module-setup.sh

@@ -147,4 +147,5 @@ install() {
         inst_hook cmdline 01 "$moddir/parse-kernel.sh"
     fi
     inst_simple "$moddir/insmodpost.sh" /sbin/insmodpost.sh
+    inst_multiple -o sysctl
 }