Ensure the rebuild of grub.cfg with plymouth.ignore-serial-consoles

(cherry picked from commit a44160b1bb)

kernel.spec.in

@@ -426,8 +426,6 @@ done
 /sbin/depmod -a %{kernelrelease}
 
 %posttrans
-/bin/kernel-install add %{kernelrelease} /boot/vmlinuz-%{kernelrelease} || exit $?
-
 # with kernel-4.14+ plymouth detects hvc0 serial console and forces text boot
 # we simply make plymouth ignore it to recover the splash screen
 if [ -f /etc/default/grub ]; then
@@ -436,6 +434,8 @@ if [ -f /etc/default/grub ]; then
     fi
 fi
 
+/bin/kernel-install add %{kernelrelease} /boot/vmlinuz-%{kernelrelease} || exit $?
+
 # grubby (used by new-kernel-pkg) do not understand xen entries in grub2 config
 if [ -x /sbin/new-kernel-pkg -a -e /boot/grub2/grub.cfg ]; then
     grub2-mkconfig > /boot/grub2/grub.cfg