sim: Add explicit copyright and licenses to the sim

Add an apache SPDX header and explicit license lines.  The date ranges
of the license lines is derived from the git history.  Having these
explicitly present will make contributions from other parties easier, as
they will simply be able to add their own copyright line, rather than
having to describe that it only covers modifications.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/sim/mcuboot-sys/src/api.rs b/sim/mcuboot-sys/src/api.rs
index a474e8f..a88cfcf 100644
--- a/sim/mcuboot-sys/src/api.rs
+++ b/sim/mcuboot-sys/src/api.rs
@@ -1,3 +1,8 @@
+// Copyright (c) 2017-2019 Linaro LTD
+// Copyright (c) 2018-2019 JUUL Labs
+//
+// SPDX-License-Identifier: Apache-2.0
+
 //! HAL api for MyNewt applications
 
 use crate::area::CAreaDesc;
diff --git a/sim/mcuboot-sys/src/area.rs b/sim/mcuboot-sys/src/area.rs
index 779157a..dc05e39 100644
--- a/sim/mcuboot-sys/src/area.rs
+++ b/sim/mcuboot-sys/src/area.rs
@@ -1,3 +1,9 @@
+// Copyright (c) 2017-2019 Linaro LTD
+// Copyright (c) 2018-2019 JUUL Labs
+// Copyright (c) 2019 Arm Limited
+//
+// SPDX-License-Identifier: Apache-2.0
+
 //! Describe flash areas.
 
 use simflash::{Flash, SimFlash, Sector};
diff --git a/sim/mcuboot-sys/src/c.rs b/sim/mcuboot-sys/src/c.rs
index 6df89e4..61276e2 100644
--- a/sim/mcuboot-sys/src/c.rs
+++ b/sim/mcuboot-sys/src/c.rs
@@ -1,4 +1,10 @@
-/// Interface wrappers to C API entering to the bootloader
+// Copyright (c) 2017-2019 Linaro LTD
+// Copyright (c) 2017-2019 JUUL Labs
+// Copyright (c) 2019 Arm Limited
+//
+// SPDX-License-Identifier: Apache-2.0
+
+//! Interface wrappers to C API entering to the bootloader
 
 use crate::area::AreaDesc;
 use simflash::SimMultiFlash;
diff --git a/sim/mcuboot-sys/src/lib.rs b/sim/mcuboot-sys/src/lib.rs
index 351666e..8acb246 100644
--- a/sim/mcuboot-sys/src/lib.rs
+++ b/sim/mcuboot-sys/src/lib.rs
@@ -1,3 +1,7 @@
+// Copyright (c) 2017-2019 Linaro LTD
+//
+// SPDX-License-Identifier: Apache-2.0
+
 mod area;
 pub mod c;