classes: kernel-balena-noimage: add extra space

When appending a variable a space needs to be prefixed to create a
space separated list.

Change-type: patch
Signed-off-by: Alex Gonzalez <[email protected]>

meta-balena-kirkstone/classes/kernel-balena-noimage.bbclass

@@ -5,5 +5,5 @@
 #    the initramfs bundled kernel image
 python __anonymous() {
     kernel_image_type = d.getVar('KERNEL_IMAGETYPE')
-    d.appendVar('PACKAGE_EXCLUDE', 'kernel-image-%s-*' % kernel_image_type.lower())
+    d.appendVar('PACKAGE_EXCLUDE', ' kernel-image-%s-*' % kernel_image_type.lower())
 }