rename LICENSE to COPYING

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Add license X11 for libhsakmt

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Add license for firmware

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Add License section to readme

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>