[sw] Move device README docs under device/ folder.
diff --git a/sw/boot_rom/README.md b/sw/device/boot_rom/README.md
similarity index 100%
rename from sw/boot_rom/README.md
rename to sw/device/boot_rom/README.md
diff --git a/sw/examples/hello_world/README.md b/sw/device/examples/hello_world/README.md
similarity index 100%
rename from sw/examples/hello_world/README.md
rename to sw/device/examples/hello_world/README.md