images: re-license as Expat license (so-called MIT)

This changes the license of all files in the images/ directory from
GPLv2 to the Expat license (so-called MIT).

According to git the files have been authored by:

   Abhishek Dubey
   Adrian Reber
   Alexander Mikhalitsyn
   Alice Frosi
   Andrei Vagin (Andrew Vagin, Andrey Vagin)
   Cyrill Gorcunov
   Dengguangxing
   Dmitry Safonov
   Guoyun Sun
   Kirill Tkhai
   Kir Kolyshkin
   Laurent Dufour
   Michael Holzheu
   Michał Cłapiński
   Mike Rapoport
   Nicolas Viennot
   Nikita Spiridonov
   Pavel Emelianov (Pavel Emelyanov)
   Pavel Tikhomirov
   Radostin Stoyanov
   rbruno@gsd.inesc-id.pt
   Sebastian Pipping
   Stanislav Kinsburskiy
   Tycho Andersen
   Valeriy Vdovin

The Expat license (so-called MIT) can be found here:
https://opensource.org/licenses/MIT

According to that link the correct SPDX short identifier is 'MIT'.

https://spdx.org/licenses/MIT.html

Signed-off-by: Adrian Reber <areber@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/images/cpuinfo.proto b/images/cpuinfo.proto
index 8ee629c2c..15860a90c 100644
--- a/images/cpuinfo.proto
+++ b/images/cpuinfo.proto
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 syntax = "proto2";
 
 message cpuinfo_x86_entry {