testsuite: Remove restrictions on VSX tests.

testsuite: Remove restrictions on VSX tests.

Some of the testcases in gcc.target/powerpc have unnecessarily strict
requirements and run correctly on more powerpc targets.  This patch
removes the restrictions and adds appropriate HW requirements.

gcc/testsuite/ChangeLog

2020-06-30  David Edelsohn  <dje.gcc@gmail.com>

	* gcc.target/powerpc/pr90763.c: Adjust requirements.
	* gcc.target/powerpc/vsx-vector-1.c: Same.
	* gcc.target/powerpc/vsx-vector-2.c: Same.
	* gcc.target/powerpc/vsx-vector-3.c: Same.
	* gcc.target/powerpc/vsx-vector-4.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.
	* gcc.target/powerpc/vsx-vector-abss.c: Same.
	* gcc.target/powerpc/vsx-vectorize-1.c: Same.
	* gcc.target/powerpc/vsx-vectorize-2.c: Same.
	* gcc.target/powerpc/vsx-vectorize-3.c: Same.
	* gcc.target/powerpc/vsx-vectorize-4.c: Same.
	* gcc.target/powerpc/vsx-vectorize-5.c: Same.
	* gcc.target/powerpc/vsx-vectorize-6.c: Same.
	* gcc.target/powerpc/vsx-vectorize-7.c: Same.
	* gcc.target/powerpc/vsx-vectorize-8.c: Same.