testsuite: [arm/mve] Use dg-add-options arm_v8_1m_mve in MVE tests

testsuite: [arm/mve] Use dg-add-options arm_v8_1m_mve in MVE tests

Several ARM/MVE tests can be compiled even if the toolchain does not
support -mfloat-abi=hard (softfp is OK).

Use dg-add-options arm_v8_1m_mve or arm_v8_1m_mve_fp instead of using
dg-additional-options.

2020-04-22  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/testsuite/
	* gcc.target/arm/mve/intrinsics/mve_vector_float.c: Use
	arm_v8_1m_mve_fp.
	* gcc.target/arm/mve/intrinsics/mve_vector_float1.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_float2.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_int.c: Use
	arm_v8_1m_mve.
	* gcc.target/arm/mve/intrinsics/mve_vector_int1.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_int2.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint1.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint2.c: Likewise.