Apply squashfs filesystem to the initrd(ramdisk) of TV
squashfs supports compression.
=====================================
| ext4 (M byte) | squashfs (M byte) |
====================================|
| 6.5 | 3.7 |
| 10.0 | 5.5 |
-------------------------------------
| 13.0 | 7.0 |
| 13.4 | 7.3 |
-------------------------------------
| 13.8 | 7.7 |
| 14.3 | 7.9 |
-------------------------------------
| 15.0 | 8.2 |
| 16.3 | 9.1 |
=====================================
Change-Id: Ie922ba91d0600cddf4dae93e87e9905099ada9c6