hammerhead: Better mount options to improve performance

Change-Id: I18f7165c2ff8547b7968d946336d948fe30522b1
Enable bootanimation optimizations
Even better mount options
hammerhead: remove apn copy step

Use World APNs file instead of default apn list from sample

Change-Id: I643efc70d8aa6482a2a4537dea67b2697307174c
Disable secure discard