get rid of lkmc package, move userland and kernel-modules to top

Rationale: we already had a non buildroot build system,
maintaining both will be hard, and having short paths is more awesome.

kernel_modules/character_device_create.c

@@ -0,0 +1,76 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#automatically-create-character-device-file-on-insmod */
+
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/fs.h> /* register_chrdev, unregister_chrdev */
+#include <linux/module.h>
+#include <linux/seq_file.h> /* seq_read, seq_lseek, single_release */
+
+#define NAME "lkmc_character_device_create"
+
+static int major = -1;
+static struct cdev mycdev;
+static struct class *myclass = NULL;
+
+static int show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "abcd");
+	return 0;
+}
+
+static int open(struct inode *inode, struct file *file)
+{
+	return single_open(file, show, NULL);
+}
+
+static const struct file_operations fops = {
+	.llseek = seq_lseek,
+	.open = open,
+	.owner = THIS_MODULE,
+	.read = seq_read,
+	.release = single_release,
+};
+
+static void cleanup(int device_created)
+{
+    if (device_created) {
+        device_destroy(myclass, major);
+        cdev_del(&mycdev);
+    }
+    if (myclass)
+        class_destroy(myclass);
+    if (major != -1)
+        unregister_chrdev_region(major, 1);
+}
+
+static int myinit(void)
+{
+    int device_created = 0;
+
+    /* cat /proc/devices */
+    if (alloc_chrdev_region(&major, 0, 1, NAME "_proc") < 0)
+        goto error;
+    /* ls /sys/class */
+    if ((myclass = class_create(THIS_MODULE, NAME "_sys")) == NULL)
+        goto error;
+    /* ls /dev/ */
+    if (device_create(myclass, NULL, major, NULL, NAME "_dev") == NULL)
+        goto error;
+    device_created = 1;
+    cdev_init(&mycdev, &fops);
+    if (cdev_add(&mycdev, major, 1) == -1)
+        goto error;
+    return 0;
+error:
+    cleanup(device_created);
+    return -1;
+}
+
+static void myexit(void)
+{
+    cleanup(1);
+}
+
+module_init(myinit)
+module_exit(myexit)
+MODULE_LICENSE("GPL");