tests: Removing gem5/hello_se/ref/simerr

This is not needed in any comparison we make. It was probably added in
error.

Change-Id: Ie771654f73d101d0ef90ca6e2864a7cb684b3919
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34996
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/tests/gem5/hello_se/ref/simerr b/tests/gem5/hello_se/ref/simerr
deleted file mode 100644
index e69de29..0000000
--- a/tests/gem5/hello_se/ref/simerr
+++ /dev/null