To support single board computers on riscv64.

kernel-image-std-pae removed from Sisyphus and p10.

kernel-modules-igb not available for branch >= p7
kernel module e1000e in p10 is packed according to the blacklist
scheme, this blacklist is applied to all the kernels and the
internal e1000e from un-def-5.15 does not work as a result.
Reported by boyarsh@

Needed for i2c support on singleboard. Needed for bootloading with
micro-SD on Rockchip rk3399.

Now, when CONFIG_USB=y, to disable usb autosuspend, must pass this
parameter when bootloading the kernel.
Package disable-usb-autosuspend has become useless.

It does not need to be set to std-def, if it is available, then it
is already by default.

fix commit e00c4243 regression.

rtc not needed in initrd.

make-initrd supports adding module directories.

This will allow in the future to use a different initrd option when
building images, for example dracut.
Also drop old make-inird support.

Another workaround for https://bugzilla.altlinux.org/show_bug.cgi?id=39663

Available for mipsel too.

In make-initrd >= 2.5.0-alt1 feature usb requires kernel modules optional.

This features not needed for auto-detect.
We also add features not only to initrd.mk, but also specify them
explicitly in the command.

Kernel flavours differ on secondary arches (and there's a bunch
of platform-specific kernels for ARM systems), so let's provide
some more flexible scheme than hardwiring un-def into images.

This might be further enhanced to e.g. set KFLAVOURS to
$$(KFLAVOURS_LATEST)) with it being preset to un-def
where available so rpi images could set it to rpi-un,
and still get reasonable starterkits for free.

The corresponding commit in RELENG-e2k-p9-starterkits
private branch just tore un-def apart => unmergeable.

xhci-plat-hcd needed for USB boot on Raspberry Pi 4B
dwc2 needed for USB boot on Raspberry Pi 3B, 3B+

VM_INITRDFEATURES qemu not allowed for e2k only. This feature
added modules optionaly.
VM_INITRDFEATURES usb allowed for all arches, but the presence of all
modules is required. Therefore, for all arches all usb modules are
optionally added.

The entry in /etc/fstab about the mount parameters of the root
partition needs to be done not only for builds with u-boot.
But, if the record already exists, then it will not be added.
The file system type is set by the variable VM_FSTYPE.