add buildsys fix for clean target

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

patches/kernel/0014-Ubuntu-remove-leftover-reference-of-ubuntu-hio-drive.patch

@@ -0,0 +1,32 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Thomas Lamprecht <t.lamprecht@proxmox.com>
+Date: Sat, 12 Mar 2022 16:07:49 +0100
+Subject: [PATCH] Ubuntu: remove leftover reference of 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/
+ ##
+ ##