torture: Remove duplicated argument -enable-kvm for ppc64

The qemu argument -enable-kvm is duplicated because the qemu_args bash
variable in kvm-test-1-run.sh already provides it.  This commit therefore
removes the ppc64-specific copy in functions.sh.
Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>

tools/testing/selftests/rcutorture/bin/functions.sh

@@ -250,7 +250,7 @@ identify_qemu_args () {
 		echo -machine virt,gic-version=host -cpu host
 		;;
 	qemu-system-ppc64)
-		echo -enable-kvm -M pseries -nodefaults
+		echo -M pseries -nodefaults
 		echo -device spapr-vscsi
 		if test -n "$TORTURE_QEMU_INTERACTIVE" -a -n "$TORTURE_QEMU_MAC"
 		then