[configs] Install archiso initcpio files in /etc/initcpio

https://projects.archlinux.org/archiso.git/commit/?id=89e89bd96bb25ca71c21b0f5f3fcf354a8ad51f4
[configs/alter] Make archiso as an essential
[configs/releng] Always load intel-ucode in early boot stage

https://projects.archlinux.org/archiso.git/commit/?id=d5ee91554befdc03777d9d36dfbf9549dae3ec9c

https://lists.archlinux.org/pipermail/arch-releng/2014-October/003458.html
[configs/alter] Always load intel-ucode in early boot stage