Remove haveged

haveged was presumably added to increase entropy and prevent entropy
starvation.

A few things has changed since, most notable:
* the kernel actively tries to add entropy (jitter entropy)[1][2][3][4]
* /dev/random no longer blocks after CRNG initialization[5][6]

[1] https://github.com/torvalds/linux/commit/3f2dc2798b81531fd93a3b9b7c39da47ec689e55
[2] https://github.com/torvalds/linux/commit/50ee7529ec4500c88f8664560770a7a1b65db72b
[3] https://lore.kernel.org/lkml/alpine.DEB.2.21.1909290010500.2636@nanos.tec.linutronix.de/T/
[4] https://lwn.net/Articles/800509/
[5] https://github.com/torvalds/linux/commit/30c08efec8884fb106b8e57094baa51bb4c44e32
[6] https://lwn.net/Articles/808575/
6 jobs for remove-haveged in 25 minutes and 18 seconds (queued for 1 second)
Status Name Job ID Coverage
  Lint
passed shellcheck #17603

00:00:12

passed shfmt #17604

00:00:09

 
  Build
passed build #17605
fast-single-thread

00:21:05

 
  Test
passed test-basic-qemu #17607
fast-single-thread

00:03:03

passed test-cloudimg-qemu #17608
fast-single-thread

00:03:59

passed test-vagrant-boxes-format #17606

00:00:43