testsuite: Restore lp64 for some gcc.target/powerpc testcases.

testsuite: Restore lp64 for some gcc.target/powerpc testcases.

gcc/testsuite/ChangeLog

2020-07-01  David Edelsohn  <dje.gcc@gmail.com>

	* gcc.target/powerpc/direct-move-double1.c: Require lp64.
	* gcc.target/powerpc/direct-move-float1.c: Same.
	* gcc.target/powerpc/direct-move-float3.c: Same.
	* gcc.target/powerpc/direct-move-vint1.c: Same.
	* gcc.target/powerpc/vsx-vector-5.c: Same.
	* gcc.target/powerpc/vsx-vector-6.p7.c: Same.
	* gcc.target/powerpc/vsx-vector-6.p8.c: Same.
	* gcc.target/powerpc/vsx-vector-6.p9.c: Same.