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[Raspberry_Pi.md] removes the entire hwrng block

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Reflecting kernel changes from earlier this year, poolsize nowadays is 256, kernel nowadays should be able to handle hwrng without rngd/haveged.
Can't test on every RPI but at least true on rpi4 aarch64 w/rpi kernel.
See https://github.com/nhorman/rng-tools/issues/167#issuecomment-1099812490
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@ -175,32 +175,6 @@ enabled.
This should also apply for Raspberry Pi 2 by using the `bcm2709_wdog` module
and Raspberry Pi 3 by using the `bcm2835_wdt` module.
## Hardware Random Number Generator
Arch Linux ARM for the Raspberry Pi had the `bcm2708-rng` module set to load at
boot; starting with kernel 4.4.7 the `bcm2835_rng` module replaces the
former on Raspberry Pi 2 and Raspberry Pi 3 units.
Install `rng-tools` and
tell the Hardware RNG Entropy Gatherer Daemon (`rngd`) where to find the hardware
random number generator. This can be done by editing `/etc/conf.d/rngd`:
RNGD_OPTS="-o /dev/random -r /dev/hwrng"
and enabling and starting the `rngd` service.
If `haveged` is running, it should be stopped and disabled, as it might
compete with `rngd` and is only preferred when there is no hardware random number
generator available.
Once completed, this change ensures that data from the
hardware random number generator is fed into the kernel's entropy pool at
`/dev/random`. To check the available entropy, run:
# cat /proc/sys/kernel/random/entropy_avail
The number it reports should be around 3000, whereas before setting up rngd it
would have been closer to 1000.
## I/O Pins
### GPIO
To be able to use the GPIO pins from Python, use the RPi.GPIO library.