drm/amdgpu: fix non-ANSI declaration of amdgpu_amdkfd_gfx_*_get_functions()

amdgpu_amdkfd_gfx_7_get_functions and amdgpu_amdkfd_gfx_8_0_get_functions
have no parameters, so use the normal void parameter convention to make
them match their prototypes in the header file
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Oded Gabbay <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c

···
 	.get_fw_version = get_fw_version
 };
 
-struct kfd2kgd_calls *amdgpu_amdkfd_gfx_7_get_functions()
+struct kfd2kgd_calls *amdgpu_amdkfd_gfx_7_get_functions(void)
 {
 	return (struct kfd2kgd_calls *)&kfd2kgd;
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c

···
 	.get_fw_version = get_fw_version
 };
 
-struct kfd2kgd_calls *amdgpu_amdkfd_gfx_8_0_get_functions()
+struct kfd2kgd_calls *amdgpu_amdkfd_gfx_8_0_get_functions(void)
 {
 	return (struct kfd2kgd_calls *)&kfd2kgd;
 }