Thanks. initramfs-tools in trusty-proposed solves this issue.
ubuntu@test:~$ zcat /boot/initrd.img-4.4.0-62-generic | cpio -idmv 2> /dev/null ubuntu@test:~$ find . -name 'xhci-plat*' ./lib/modules/4.4.0-62-generic/kernel/drivers/usb/host/xhci-plat-hcd.ko ubuntu@test:~$ dpkg --list | grep initramfs-tools ii initramfs-tools 0.103ubuntu4.7 all tools for generating an initramfs ii initramfs-tools-bin 0.103ubuntu4.7 amd64 binaries used by initramfs-tools
Thanks. initramfs-tools in trusty-proposed solves this issue.
ubuntu@test:~$ zcat /boot/initrd. img-4.4. 0-62-generic | cpio -idmv 2> /dev/null 4.4.0-62- generic/ kernel/ drivers/ usb/host/ xhci-plat- hcd.ko
ubuntu@test:~$ find . -name 'xhci-plat*'
./lib/modules/
ubuntu@test:~$ dpkg --list | grep initramfs-tools
ii initramfs-tools 0.103ubuntu4.7 all tools for generating an initramfs
ii initramfs-tools-bin 0.103ubuntu4.7 amd64 binaries used by initramfs-tools