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/usr/share/initramfs-tools/hooks/touch is in initramfs-tools-ubuntu-touch 0.94vivid5.

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The actual contents of the file can be viewed below.

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#!/bin/sh -e

MINKVER="2.6.24"
PREREQ=""

# Output pre-requisites
prereqs()
{
        echo "$PREREQ"
}

case "$1" in
    prereqs)
        prereqs
        exit 0
        ;;
esac

. /usr/share/initramfs-tools/hook-functions

copy_exec /sbin/swapon /sbin
copy_exec /sbin/reboot /sbin
copy_exec /sbin/e2fsck /sbin
copy_exec /sbin/resize2fs /sbin
copy_exec /bin/chown /bin
copy_exec /bin/mount /bin
copy_exec /bin/readlink /sbin
copy_exec /usr/bin/adbd /sbin
copy_exec /lib/x86_64-linux-gnu/libz.so.1
copy_exec /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
copy_exec /lib/x86_64-linux-gnu/libdl.so.2