components/boot-eln: Add full kernel to BootDiskCore

The boot environment for non-cloud disk images was incomplete,
leading to images not bootable on real hardware. This change
adds the missing packages to fix that.

components/boot-eln.xml

@@ -76,4 +76,10 @@
 		<package name="grub2-efi-aa64-cdboot" arch="aarch64"/>
 		<package name="grub2-efi-x64-cdboot" arch="x86_64"/>
 	</packages>
+	<packages type="image" patternType="plusRecommended" profiles="BootDiskCore">
+		<package name="glibc-all-langpacks"/>
+		<package name="kernel"/>
+		<package name="kernel-modules"/>
+		<package name="kernel-modules-extra"/>
+	</packages>
 </image>