gdb/testsuite: Add require allow_hipcc_tests in gdb.rocm/mi-attach.exp

The gdb.rocm/mi-attach.exp test is missing a proper `require` check to
ensure that the current configuration can run ROCm tests.  This issue
has been reported by Baris.

This patch adds the missing `allow_hipcc_tests` requirement, and also
adds `load_lib rocm.exp` to enable this test.

Change-Id: Ie136adfc2d0854268b92af5c4df2dd0334dce259
Reviewed-By: Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
Approved-By: Tom Tromey <tom@tromey.com>

gdb/testsuite/gdb.rocm/mi-attach.exp

diff --git a/gdb/testsuite/gdb.rocm/mi-attach.exp b/gdb/testsuite/gdb.rocm/mi-attach.exp
index 2ca610c..37ce92a 100644
--- a/gdb/testsuite/gdb.rocm/mi-attach.exp
+++ b/gdb/testsuite/gdb.rocm/mi-attach.exp
@@ -13,10 +13,11 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+load_lib rocm.exp
 load_lib mi-support.exp
 set MIFLAGS "-i=mi"
 
-require can_spawn_for_attach
+require can_spawn_for_attach allow_hipcc_tests
 
 standard_testfile .cpp