tests: Re-enable 'Hello World' 32-bit tests
tests: Re-enable 'Hello World' 32-bit tests

Due to a faul recorded here:
https://gem5.atlassian.net/browse/GEM5-1074, running 32-bit binaries in
SE mode was causing a segfault to occur. These tests were therefore
disabled until a fix could be developed. A fix was submitted here:
https://gem5-review.googlesource.com/c/public/gem5/+/51489, and, as-such
the tests should be re-enabled.

Change-Id: Id01a6d85fb5e30319e53dda97f6247bcc5302477
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/51612
Reviewed-by: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Maintainer: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5