[Ada] Simplify processing of 'Valid_Scalars on array types

[Pierre-Marie de Rodat]

When calling routine Build_Array_VS_Func that expands attribute
Valid_Scalars on array objects we tested Scalar_Part_Present on the
array's component type. This was unnecessary, because
Build_Array_VS_Func is only called after checking Scalar_Part_Present on
the array's type, which internally Scalar_Part_Present on the array's
component type.

This patch is a cleanup only; semantics is unaffected.

Tested on x86_64-pc-linux-gnu, committed on trunk

2020-06-19  Piotr Trojanek  <trojanek@adacore.com>

gcc/ada/

	* exp_attr.adb (Expand_N_Attribute_Reference): Do not call
	Scalar_Part_Present on the array component's type.
	(Build_Array_VS_Func): Remove Comp_Typ parameter, because it can
	be easily computed from the Array_Top parameter *and redundant
	parameters are confusing and error-prone).
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