arm, testsuite: fix fast-math-bb-slp-complex-mla-float.c dg-add-options

The test uses floats, not fp16 so it should use arm_v8_3a_complex_neon
instead of arm_v8_3a_fp16_complex_neon.

This makes it PASS on arm-linux-gnueabihf instead of being UNRESOLVED.

	gcc/testsuite/ChangeLog:
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mla-float.c: Use
	arm_v8_3a_complex_neon.

gcc/testsuite/gcc.dg/vect/complex/fast-math-bb-slp-complex-mla-float.c

 /* { dg-do compile } */
 /* { dg-require-effective-target vect_complex_add_float } */
 /* { dg-additional-options "-ffast-math -fdump-tree-vect-details" } */
-/* { dg-add-options arm_v8_3a_fp16_complex_neon } */
+/* { dg-add-options arm_v8_3a_complex_neon } */
 
 #define TYPE float
 #define N 16