resources: Remove deprecated resources

These are no longer used and can therefore be safely removed.

Change-Id: I4d50b8d952b5a1df162bbcac521e3c877b6b226c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-resources/+/54564
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
diff --git a/resources.json b/resources.json
index dec0e31..3aeac12 100644
--- a/resources.json
+++ b/resources.json
@@ -82,32 +82,6 @@
         },
         {
             "type" : "resource",
-            "name" : "x86-boot-exit",
-            "documentation" : "A disk image containing Ubuntu 18.04 for X86 which will run a `m5 exit` instruction after booting. [This is deprecated. Please use 'x86-ubuntu-18.04-img'].",
-            "architecture" : "X86",
-            "is_zipped" : true,
-            "md5sum" : "008a4bf505a04efed0758b49183e01f7",
-            "url" : "{url_base}/images/x86/ubuntu-18-04/boot-exit.img.gz",
-            "source" : "src/boot-exit",
-            "additional_metadata" : {
-                "root_partition": "1"
-            }
-        },
-        {
-            "type" : "resource",
-            "name" : "x86-ubuntu-img",
-            "documentation" : "A disk image containing Ubuntu 18.04 for x86. This image will run an `m5 readfile` instruction after booting. If no script file is specified an `m5 exit` instruction will be executed. [This is deprecated. Please use 'x86-ubuntu-18.04-img'].",
-            "architecture" : "X86",
-            "is_zipped" : true,
-            "md5sum" : "90e363abf0ddf22eefa2c7c5c9391c49",
-            "url" : "{url_base}/images/x86/ubuntu-18-04/x86-ubuntu.img.gz",
-            "source" : "src/x86-ubuntu",
-            "additional_metadata" : {
-                "root_partition": "1"
-            }
-        },
-        {
-            "type" : "resource",
             "name" : "x86-ubuntu-18.04-img",
             "documentation" : "A disk image containing Ubuntu 18.04 for x86. This image will run an `m5 readfile` instruction after booting. If no script file is specified an `m5 exit` instruction will be executed.",
             "architecture" : "X86",