resources: Removing ARM Linux 4.18.0 resource

We don't have the sources for this resources. As there is already other,
similar kernels to choose from with sources, we'll remove this.

Change-Id: If789170cd1dfbb58f5e7d6eddfaebf7144c9e9fe
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-resources/+/59495
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
diff --git a/resources.json b/resources.json
index 39bd9d8..1c63d9c 100644
--- a/resources.json
+++ b/resources.json
@@ -228,16 +228,6 @@
                 },
                 {
                     "type" : "resource",
-                    "name" : "arm64-linux-kernel-4.18.0",
-                    "documentation": "The Linux kernel (v4.18.0), compiled to arm64.",
-                    "architecture" : "ARM",
-                    "is_zipped" : false,
-                    "md5sum" : "29c4059d3b1b043e16bfbd8487acbcae",
-                    "url" : "{url_base}/kernels/arm/static/arm64-vmlinux-4.18.0",
-                    "source" : null
-                },
-                {
-                    "type" : "resource",
                     "name" : "x86-linux-kernel-4.19.83",
                     "documentation" : "The linux kernel (v4.19.83), compiled to X86.",
                     "architecture" : "X86",