gpu: nvgpu: Linux specific GPU characteristics flags

Make GPU characteristics flags specific to Linux code only. The
rest of driver is moved to using nvgpu_is_enabled() API.

JIRA NVGPU-259

Change-Id: I46a5a90bb34f170e9e755e7683be142ed6b18cce
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1583992
GVS: Gerrit_Virtual_Submit

drivers/gpu/nvgpu/common/linux/ioctl_ctrl_t19x.h

@@ -0,0 +1,23 @@
+/*
+ * 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.
+ */
+
+#ifndef _NVGPU_IOCTL_CTRL_T19X
+#define _NVGPU_IOCTL_CTRL_T19X
+
+#include <nvgpu/types.h>
+
+struct gk20a;
+
+u64 nvgpu_ctrl_ioctl_gpu_characteristics_flags_t19x(struct gk20a *g);
+
+#endif