drop hio from ubuntu makefile again

hio driver got removed by ubuntu already in jammy, but then they
forgot to remove this instance too, failing the clean build target,
my patch got accepted but was forgotten when doing the same in
kinetic, so here we go again

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

patches/kernel/0007-Ubuntu-remove-leftover-reference-to-ubuntu-hio-drive.patch

@@ -0,0 +1,31 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Thomas Lamprecht <t.lamprecht@proxmox.com>
+Date: Sat, 12 Mar 2022 16:19:10 +0100
+Subject: [PATCH] Ubuntu: remove leftover reference to ubuntu/hio driver
+
+A single reference to the hio driver was forgotten when it was removed
+recently. While this reference is not a problem for the build itself, it
+breaks the __clean target from 'scripts/Makefile.clean' here, as make
+cannot enter the "ubuntu/hio" folder for cleaning due to ENOENT.
+
+Fixes: 4ea6dd9afa0a0d ("UBUNTU: Remove ubuntu/hio driver")
+Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
+---
+ ubuntu/Makefile | 4 ----
+ 1 file changed, 4 deletions(-)
+
+diff --git a/ubuntu/Makefile b/ubuntu/Makefile
+index 27fa95ba242a..3bfc4494c069 100644
+--- a/ubuntu/Makefile
++++ b/ubuntu/Makefile
+@@ -15,10 +15,6 @@
+ ##
+ ##
+ ##
+-obj-$(CONFIG_HIO)             += hio/
+-##
+-##
+-##
+ obj-$(CONFIG_UBUNTU_HOST)      += ubuntu-host/
+ ##
+ ##