Use config-earlykdump test from kernel-tests

The plan is to run kernel-tests in upstream kdump-utils. Use
config-earlykdump from kernel-tests so we can retire current nfs_early
plan.

Signed-off-by: Coiby Xu <[email protected]>

Author: coiby

kernel-tests-plans/early.fmf

@@ -0,0 +1,6 @@
+summary: Kdump early dumping tests
+discover+:
+    test:
+     - /kdump/config-default-crashkernel
+     - /kdump/config-any
+     - /kdump/config-earlykdump