ext/tinycrypt: Remove code from tree

Tinycrypt is no longer maintained and NimBLE is now using Mbed TLS.

Author: sjanc

.clang-format-ignore

@@ -1,3 +1 @@
 # Skip those directories while doing style checks in the CI.
-
-ext/tinycrypt

.rat-excludes

@@ -14,9 +14,6 @@ Doxyfile
 # Ignore documentation folder
 docs
 
-# tinycrypt - BSD License.
-ext/tinycrypt
-
 # mbuf implementation - BSD License
 porting/nimble/src/os_mbuf.c
 

LICENSE

@@ -212,10 +212,6 @@ under the following license:
     COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or
     code or tables extracted from it, as desired without restriction.
 
-This product bundles tinycrypt, which is available under the "3-clause BSD"
-license. For details, and bundled files see:
-    * ext/tinycrypt/LICENSE
-
 This product bundles and partly derives from parts of the Nordic nRF52 SDK,
 which are available under a BSD style license.  Relevant files are:
     * babblesim/hw/mcu/nordic/nrf52_bsim/src/system_nrf52.c