drivers: Add GTE support

The CL adds GTE driver support in OOT. The driver is copied from nvidia
directory in dev-main with below changes.
- Added removable module support

This driver as module is needed as per the oot development requirement.

Bug 3583612

Change-Id: I2772078fb96e1b172e45befe643b4c7c569866d9
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2706260
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

include/uapi/linux/tegra-gte-ioctl.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2020-2022, NVIDIA CORPORATION & AFFILIATES.All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _TEGRA_GTE_IOCTL_H
+#define _TEGRA_GTE_IOCTL_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+/**
+ * GPIO event types
+ */
+#define TEGRA_GTE_EVENT_RISING_EDGE	0x1
+#define TEGRA_GTE_EVENT_FALLING_EDGE	0x2
+#define TEGRA_GTE_EVENT_REQ_BOTH_EDGES	(TEGRA_GTE_EVENT_RISING_EDGE | \
+					 TEGRA_GTE_EVENT_FALLING_EDGE)
+
+/**
+ * Information about a GPIO event request
+ * @global_gpio_pin: global gpio pin number to monitor event
+ * @eventflags: desired flags for the desired GPIO event line, such as
+ * EVENT_RISING_EDGE or EVENT_FALLING_EDGE
+ * @fd: if successful this field will contain a valid anonymous file handle
+ * after a HTS_CREATE_GPIO_EVENT_IOCTL operation, zero or negative value
+ * means error
+ */
+struct tegra_gte_hts_event_req {
+	__u32 global_gpio_pin;
+	__u32 eventflags;
+	int fd;
+};
+
+/**
+ * struct hts_event_data - event data
+ * @timestamp: hardware timestamp in nanosecond
+ * @dir: direction of the event
+ */
+
+struct tegra_gte_hts_event_data {
+	__u64 timestamp;
+	int dir;
+};
+
+/**
+ * Event request IOCTL command
+ */
+#define TEGRA_GTE_HTS_CREATE_GPIO_EV_IOCTL \
+					_IOWR(0xB5, 0x0, \
+					      struct tegra_gte_hts_event_req)
+
+#endif