See-also: https://forum.altlinux.org/index.php?topic=43710.msg350632#msg350632

This reverts commit c70f18fc.

Temp fix

uboot.env was breaking u-boot boot on Raspberry Pi 3 because of this.

Since the main goal for aarch64 and armh for us is Raspberry Pi,
it is always worth creating a fat32 partition for these arches.
At least for now.

Also added download support on the Raspberry Pi 3.
The following feature has appeared. The FAT partition does not
install the last installed kernel, but the first kernel in the
KFLAVOURS list. This was done in order to enable  u-boot to
default load another kernel, for example std-def.

The feature фкь-кзш4 is available for armh now.

command "rpi4-boot-nouboot --bootstrap" creates
files of kernel, initrd, dtb, cmdline.txt, config.txt
in /usr/share/u-boot/rpi_4

rpi4-boot-nouboot-filetrigger updates
files of kernel, initrd, dtb, cmdline.txt, config.txt
on FAT when updating kernel

rpi4-boot-uboot-filetrigger updates
files of u-boot and firmware
on FAT when updating u-boot

By default, in cpufreq-simple feature the ondemand
governor is configured. But only the conservative governor is available at
Raspberry Pi 4 kernels. This is change the default governor to conservative.

Network interface managed by NetworkManager is not activated when
alterator-setup is launched.

Add new feature for X11 VNC support.  Please read
features.in/x11-vnc/README for more information.

installer-feature-bootloader-$BOOTLOADER dependency of alterator-$BOOTLOADER.
This is necessary so that alterator-$BOOTLOADER is deleted after installation,
if it was not installed explicitly.
This will reduce the minimum installation of alt-server.

timeout for syslinux is measured in deciseconds, and for grub in seconds.