testsuite: Correct requirements for vadsdu*, vslv and vsrv testcases.

testsuite: Correct requirements for vadsdu*, vslv and vsrv testcases.

This patch renmoves extraneous dg-requirement restrictions on the testcases.

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/vadsdu-0.c: Remove target.
	* gcc.target/powerpc/vadsdu-1.c: Remove target.
	* gcc.target/powerpc/vadsdu-2.c: Remove target.
	* gcc.target/powerpc/vadsdu-3.c: Remove target.
	* gcc.target/powerpc/vadsdu-4.c: Remove target.
	* gcc.target/powerpc/vadsdu-5.c: Remove target.
	* gcc.target/powerpc/vadsdub-1.c: Remove target.
	* gcc.target/powerpc/vadsdub-2.c: Remove target.
	* gcc.target/powerpc/vadsduh-1.c: Remove target.
	* gcc.target/powerpc/vadsduh-2.c: Remove target.
	* gcc.target/powerpc/vadsduw-1.c: Remove target.
	* gcc.target/powerpc/vadsduw-2.c: Remove target.
	* gcc.target/powerpc/vslv-0.c: Remove target.
	* gcc.target/powerpc/vslv-1.c: Remove target.
	* gcc.target/powerpc/vsrv-0.c: Remove target.
	* gcc.target/powerpc/vsrv-1.c: Remove target.