Reimplement the terminal user access via separate syscalls

kernel/syscall/term.c

@@ -0,0 +1,18 @@
+#include <stdint.h>
+#include <stddef.h>
+#include "syscall/syscall.h"
+#include "kprintf.h"
+#include "errors.h"
+
+int32_t SYSCALL2(sys_term_write, buffer1, len1) {
+  const char *buffer = (const char *)buffer1;
+  size_t len = len1;
+
+  if (buffer == NULL) {
+    return E_INVALIDARGUMENT;
+  }
+
+  kprintf("%.*s", (int)len, buffer);
+
+  return E_OK;
+}