ramdisk+AnyKernel2: synapse: more feature control
- add toggle for frandom (which has been available in the kernel for awhile)
- add toggle for new KSM deferred timer tunable
- add controls for Z-RAM compression and maximum compression streams (Z-RAM must be reinitialized for these to take effect)
- workardound to make Z-RAM maximum compressions streams persist through Z-RAM resets
- set lz4 as the default Z-RAM compression algorithm via dvbootscript