arm/arm64: code derived from Linux must be GPL not LGPL

Also update copyrights.

Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
[Amend two other "Adapated" typos as well.]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>