Revert "Fixed random commits!"

This reverts commit be38662dff870063cf27e885bfce74da52fcd55b.
Revert "random: use the arch-specific rng in xfer_secondary_pool"

This reverts commit 1d6b15582994d38a0a12a2fbb211a720002d26ef.
Revert "random: create add_device_randomness() interface"

This reverts commit 2c4a4c1a45df88d4add9a8b7bed85962b8c64391.