[Ada] Implement CUDA_Device

[Pierre-Marie de Rodat]

This commit removes entities marked with the CUDA_Device pragma from the
packages specs and bodies they exist in.

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

gcc/ada/

	* gnat_cuda.adb (Remove_CUDA_Device_Entities): New function.
	(Expand_CUDA_Package): Call Remove_CUDA_Device_Entities.
	* gnat_cuda.ads (Expand_CUDA_Package): Expand documentation.
	* sem_prag.adb (Analyze_Pragma): Remove warning about
	CUDA_Device not being implemented.
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