Disable all warnings seen on devkitA64 GCC 15.1.0:
- Several false-positive `-Wmisleading-indentation` warnings (the
indentation is not actually misleading)
- One `-Wuse-after-free` warning, which looks alarming and represents
very dubious design, but is ultimately harmless (a freed pointer is
passed to a function that doesn't use it).
- Some `-Wunused-function` warnings in `simd/neon.h`
* 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
