add aarch64 local preset and conf

etc/archboot/aarch64-local.conf

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+# vim:set ft=sh:
+# Created by Tobias Powalowski <tpowa@archlinux.org>
+
+# For more information on how using mkinitcpio please refer to the main config file
+# or check the wiki.
+MODULES=()
+BINARIES=()
+FILES=()
+
+# SETUP
+#
+# Please change the hooks only if you know what you are doing.
+HOOKS=(udev keyboard archboot_base_common archboot_base_latest \
+archboot_installer_common archboot_installer_latest archboot_kexec \
+archboot_licenses archboot_installer_local)
+
+# COMPRESSION
+# Use this to compress the initramfs image. By default, gzip compression
+# is used. Use 'cat' to create an uncompressed image.
+COMPRESSION="zstd"
+#COMPRESSION="gzip"
+#COMPRESSION="bzip2"
+#COMPRESSION="lzma"
+#COMPRESSION="xz"
+#COMPRESSION="lzop"
+#COMPRESSION="lz4"
+
+# COMPRESSION_OPTIONS
+# Additional options for the compressor
+COMPRESSION_OPTIONS=(-19)
+MODULES_DECOMPRESS="no"

etc/archboot/presets/aarch64-local

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+# vim:set ft=sh:
+# Created by Tobias Powalowski <tpowa@archlinux.org>
+
+# mkinitcpio config file, defaulted to stock config file
+MKINITCPIO_CONFIG="/etc/archboot/aarch64-local.conf"
+
+# kernel version, defaulted to build for runtime kernel
+ALL_kver="/boot/Image"
+