tests,arch-sparc: Move SPARC insttests to long

We should not compile and run SPARC tests as part of the quick tests.
The SPARC insttests have thefore been moved to be part of the long
tests.

Change-Id: I8e4263414af2d7a882715202124671dc0723d961
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34136
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

tests/gem5/insttest_se/test.py

@@ -72,4 +72,5 @@ for isa in test_progs:
                     config_args=['--cmd', joinpath(path, binary),
                         '--cpu-type', cpu, '--caches'],
                     valid_isas=(isa.upper(),),
+                    length = constants.long_tag,
                 )