arm, testsuite: remove duplicate dg-add-options arm_v8_3a_complex_neon

These two testcases have twice the same dg-add-options
arm_v8_3a_complex_neon, the patch removes one of them.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/complex/complex-operations-run.c: Remove duplicate
	dg-add-options arm_v8_3a_complex_neon.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-add-pattern-double.c:
	Likewise.