ams: replace sept with tsec firmware (#1594)

* ams: replace sept with tsec firmware

This replaces sept with a custom tsec key derivation firmware.

NOTE: This does not use any TSEC exploits whatsoever; it is a well-signed
TSEC binary assembled with envyas and signed with the real cauth key.

For more details, contact SciresM#0524.

* fusee: only set SBK if it's readable

troposphere/daybreak/nanovg/.gitignore

@@ -79,9 +79,8 @@ dkms.conf
 *.nam
 *.til
 
-# KEYS file for sept-secondary.
+# Compiled python files.
 *.pyc
-sept/sept-secondary/KEYS.py
 
 .**/