LICENSES: Add missing licenses and exceptions

These licenses and exceptions are allowed by coreboot's license checker,
but the copies of the licenses were missing from the LICENSES directory.

Signed-off-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Change-Id: Ic4233e556de08275fe50f1ec83828f9470b4b566
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66494
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

LICENSES/exceptions/Linux-syscall-note.txt

@@ -0,0 +1,12 @@
+NOTE! This copyright does *not* cover user programs that use kernel
+services by normal system calls - this is merely considered normal use
+of the kernel, and does *not* fall under the heading of "derived work".
+Also note that the GPL below is copyrighted by the Free Software
+Foundation, but the instance of code that it refers to (the Linux
+kernel) is copyrighted by me and others who actually wrote it.
+
+Also note that the only valid version of the GPL as far as the kernel is
+concerned is _this_ particular version of the license (ie v2, not v2.2
+or v3.x or whatever), unless explicitly otherwise stated.
+
+Linus Torvalds