kbuild: Move gen_init_cpio and gen_initramfs.sh to scripts/

gen_init_cpio and gen_initramfs.sh are part of kbuild and required for
all kernel builds w/ CONFIG_BLK_DEV_INITRD. Move both to scripts/

kbuild: Move gen_init_cpio and gen_initramfs.sh to scripts/

gen_init_cpio and gen_initramfs.sh are part of kbuild and required for
all kernel builds w/ CONFIG_BLK_DEV_INITRD. Move both to scripts/ to be
more clear about their importance.

Link: https://lore.kernel.org/all/aSdrCFkUQup3qb-q@derry.ads.avm.de/
Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nicolas Schier <nsc@kernel.org>
Link: https://patch.msgid.link/20260928-move-gen_init_cpio-to-scripts-v4-2-f437a33c40ac@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

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