gpu: nvgpu: Wrappers for checking platform type

Add nvgpu_* wrappers for determining if we're running in simulation
or silicon, and if we're running in hypervisor.

The new wrappers require struct gk20a pointer, and gk20a_fence_wait()
did not have access to one. Add struct gk20a pointer as the first
parameter.

JIRA NVGPU-16

Change-Id: I73b2b8f091ca29fb1827054abd2adaf583710331
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1331565
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/linux/soc.c

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <soc/tegra/chip-id.h>
+
+#include <nvgpu/soc.h>
+
+bool nvgpu_platform_is_silicon(struct gk20a *g)
+{
+	return tegra_platform_is_silicon();
+}
+
+bool nvgpu_platform_is_simulation(struct gk20a *g)
+{
+	return tegra_platform_is_linsim() || tegra_platform_is_vdk();
+}
+
+bool nvgpu_is_hypervisor_mode(struct gk20a *g)
+{
+	return is_tegra_hypervisor_mode();
+}