add kalsrseed support

zhang ningrequested to merge
zhangn1985/u-boot-menu:kaslrseed into debian/master

KALSR is enable default in kernel, but due to lack of seed, it actually not work

from u-boot 2022.04 it supports kalsrseed cmd in extlinux.conf, if related platform supports RNG in u-boot.

thus add kalsrseed support in u-boot-menu to enable KALSR by default

Signed-off-by: Zhang Ning zhangn1985@outlook.com

Edited by zhang ning

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