RISC-V: testsuite: Remove redundant vector_hw and zvfh_hw.

RISC-V: testsuite: Remove redundant vector_hw and zvfh_hw.

This replaces the now-redundant vector_hw and zvfh_hw checks in the
testsuite by riscv_v and riscv_zvfh.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/binop/copysign-zvfh-run.c:
	Replace riscv_zvfh_hw with riscv_zvfh.
	* gcc.target/riscv/rvv/autovec/binop/vadd-zvfh-run.c: Ditto.
	* gcc.target/riscv/rvv/autovec/binop/vdiv-zvfh-run.c: Ditto.
	* gcc.target/riscv/rvv/autovec/binop/vmax-zvfh-run.c: Ditto.
	* gcc.target/riscv/rvv/autovec/binop/vmin-zvfh-run.c: Ditto.
	* gcc.target/riscv/rvv/autovec/binop/vmul-zvfh-run.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_copysign-zvfh-run.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-10.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-6.c: Allow
	overriding N.
	* gcc.target/riscv/rvv/autovec/unop/abs-zvfh-run.c: Replace
	riscv zvfh_hw with riscv_zvfh.
	* gcc.target/riscv/rvv/autovec/unop/vneg-zvfh-run.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-10.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-11.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-12.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-2.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-5.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-6.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-7.c: Ditto.
	* gcc.target/riscv/rvv/autovec/widen/widen_run_zvfh-8.c: Ditto.
	* lib/target-supports.exp: Remove riscv_vector_hw and
	riscv_zvfh_hw.