video: camera: Port RTCPU drivers to OOT tree

Port RTCPU drivers from kernel/nvidia to kernel/nvidia-oot.
In addition to copying the files this patch:
1) Modifies make files to build rtcpu drivers as modules
2) Modifies licenses of all ported files to SPDX
3) Adds MODULE_LICENSE macro to all modules
4) Removes checks for old kernel versions and the dead code after those checks
5) Fixes style errors according to checkpatch.pl

Change-Id: If64296a22ce958e5326c7509cb69f8f7154f598e
Signed-off-by: Frank Chen <frankc@nvidia.com>
Signed-off-by: Matti Ryttylainen <mryttylainen@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2783040
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Ankur Pawar <ankurp@nvidia.com>
Reviewed-by: Semi Malinen <smalinen@nvidia.com>
Reviewed-by: Pekka Pessi <ppessi@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

include/linux/tegra-camera-rtcpu.h

@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ */
+
+#ifndef _LINUX_TEGRA_CAMERA_RTCPU_H_
+#define _LINUX_TEGRA_CAMERA_RTCPU_H_
+
+#include <linux/types.h>
+
+struct device;
+
+int tegra_camrtc_iovm_setup(struct device *dev, dma_addr_t iova);
+ssize_t tegra_camrtc_print_version(struct device *dev, char *buf, size_t size);
+int tegra_camrtc_reboot(struct device *dev);
+int tegra_camrtc_restore(struct device *dev);
+bool tegra_camrtc_is_rtcpu_alive(struct device *dev);
+void tegra_camrtc_flush_trace(struct device *dev);
+
+bool tegra_camrtc_is_rtcpu_powered(void);
+
+#define TEGRA_CAMRTC_VERSION_LEN 128
+
+int tegra_camrtc_ping(struct device *dev, u32 data, long timeout);
+void tegra_camrtc_ivc_ring(struct device *dev, u16 group);
+
+#endif