Automatically update EFI files after kernel update

From: https://wiki.archlinux.org/title/EFI_system_partition#Replacing_the_mkinitcpio_hook

As the presets in /etc/mkinitcpio.d/ support shell scripting, the kernel and initramfs can be copied by just editing the presets.

Edit mkinitcpio hook

/etc/mkinitcpio.d/linux.preset (or linux-whatever.preset)
+ESP_DIR="/boot/efi/EFI"

#ALL_config="/etc/mkinitcpio.conf"
-ALL_kver="/boot/vmlinuz-linux"
+ALL_kver="$ESP_DIR/vmlinuz-linux"

PRESETS=('default' 'fallback')

-default_image="/boot/initramfs-linux.img"
+default_image="$ESP_DIR/initramfs-linux.img"

-fallback_image="/boot/initramfs-linux-fallback.img"
+fallback_image="$ESP_DIR/initramfs-linux-fallback.img"

fallback_options="-S autodetect"