fw: Import tkey-libs fw-2

This is an import of the fw-2 tag of tkey-libs.

We import the entire tkey-libs repo minus dot files into the
tillitis-key1 repo to make it very simple not to make mistakes
regarding which firmware tag depends on which tkey-libs tag,
especially considering locking down with NVCM.

Please see README for information about developing with another
tkey-libs or how to import future tkey-libs.

Since tkey-libs is now a part of the repo we also add tkey-libs to the
clean_fw target.

hw/application_fpga/tkey-libs/include/tkey/assert.h

@@ -0,0 +1,29 @@
+// SPDX-FileCopyrightText: 2022 Tillitis AB <tillitis.se>
+// SPDX-License-Identifier: BSD-2-Clause
+
+#ifndef TKEY_ASSERT_H
+#define TKEY_ASSERT_H
+
+#include <tkey/io.h>
+
+#if defined(QEMU_DEBUG)
+#define assert(expr)                                                           \
+	((expr) ? (void)(0)                                                    \
+		: assert_fail(IO_QEMU, #expr, __FILE__, __LINE__, __func__))
+
+#elif defined(TKEY_DEBUG)
+
+#define assert(expr)                                                           \
+	((expr)                                                                \
+	     ? (void)(0)                                                       \
+	     : assert_fail(IO_TKEYCTRL, #expr, __FILE__, __LINE__, __func__))
+
+#else
+
+#define assert(expr) ((expr) ? (void)(0) : assert_halt())
+#endif
+
+void assert_fail(enum ioend dest, const char *assertion, const char *file,
+		 unsigned int line, const char *function);
+void assert_halt(void);
+#endif