testsuite: arm: rework some target-supports checks to use -mfpu=auto

Several target-supports checks for Arm are still using the antiquated
-mfpu=... setting rather than picking up FPU extensions via the
architecture specification.  This causes problems when tests are
layered because they do not consistently override each other.

Arguably, that is incorrect anyway: you can't test two sets of flag
combinations independently and then expect to be able to apply both
of them, but this change at least makes this behave in a reasonable
way provided the second set of flags fully overrides the first.

gcc/testsuite/ChangeLog:

	* lib/target-supports.exp:
	(check_effective_target_arm_v8_3a_complex_neon_ok_nocache):
	Split and fill in arm and aarch64 compile options.  Remove the
	cpu_unset variable.
	(check_effective_target_arm_v8_2a_fp16_neon_ok_nocache): Likewise.
	(check_effective_target_arm_v8_3a_fp16_complex_neon_ok_nocache):
	Likewise.
	(check_effective_target_arm_neon_ok_nocache): Rework to use
	-mfpu=auto.
	(check_effective_target_arm_neon_fp16_ok_nocache): Likewise.

Co-authored-by: Artemiy Volkov <artemiy.volkov@arm.com>

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