LICENSES: Add licenses used in the coreboot repo

Here are example locations of these licenses:
    Apache-2.0 - src/soc/sifive
    BSD-3-Clause - Throughout coreboot & libpayload source
CC-BY-4.0 - Documentation
CC-BY-SA-3.0 - Documentation/community/code_of_conduct.md
    GPL-2.0-only - Throughout coreboot source
    GPL-2.0-or-later - Throughout coreboot source
    GPL-3.0-only - util/amdtools
    GPL-3.0-or-later - src/lib/[gcov/libgcov/gnat]
    ISC - src/lib/ubsan.c, soc/qualcomm/ipq806x/include/soc/gsbi.h, others
    MIT - soc/nvidia/tegra210/mipi_dsi.c, files in mainboard/cavium/
    X11 - include/device/drm_dp_helper.h, drivers/aspeed/common/ast_tables.h

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: Icf20c0227d4fe8efb0d337a76935797a1bc33f0f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36388
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/LICENSES/MIT.txt b/LICENSES/MIT.txt
new file mode 100644
index 0000000..204b93d
--- /dev/null
+++ b/LICENSES/MIT.txt
@@ -0,0 +1,19 @@
+MIT License Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.