pyramid:init: Replace firmware symlinks

 * Previously firmware was linked to /system/etc/firmware but new selinux
policy denies any writes to /system partition except recovery.
 * Cleanup some whitepaces
pyramid: Update audio policy
pyramid: Enable selinux
pyramid: Add sepolicies (WIP)
pyramid:sepolicy: Update and cleanup SEpolicies
pyramid:selinux: Remove rmt_device policy