extmod/moducryptolib: Add ucryptolib module with crypto functions.

The API follows guidelines of https://www.python.org/dev/peps/pep-0272/,
but is optimized for code size, with the idea that full PEP 0272
compatibility can be added with a simple Python wrapper mode.

The naming of the module follows (u)hashlib pattern.

At the bare minimum, this module is expected to provide:

* AES128, ECB (i.e. "null") mode, encrypt only

Implementation in this commit is based on axTLS routines, and implements
following:

* AES 128 and 256
* ECB and CBC modes
* encrypt and decrypt

py/objmodule.c

@@ -193,6 +193,9 @@ STATIC const mp_rom_map_elem_t mp_builtin_module_table[] = {
 #if MICROPY_PY_UHASHLIB
     { MP_ROM_QSTR(MP_QSTR_uhashlib), MP_ROM_PTR(&mp_module_uhashlib) },
 #endif
+#if MICROPY_PY_UCRYPTOLIB
+    { MP_ROM_QSTR(MP_QSTR_ucryptolib), MP_ROM_PTR(&mp_module_ucryptolib) },
+#endif
 #if MICROPY_PY_UBINASCII
     { MP_ROM_QSTR(MP_QSTR_ubinascii), MP_ROM_PTR(&mp_module_ubinascii) },
 #endif