flo: Huge update

- Disable a whole ton of debugging
- Enable RCU_FAST_NO_HZ and RCU_BOOST for better perf
- Disable test ioscheduler
- Enable NTFS FS and NLS_UTF8 to fix CIFS mounting
- Disable other useless drivers
- Enable KEXEC hardboot

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>