Fix Installation Error during rootfs step

- Add inherits update-rc.d
- create /etc/init.d directory before install step

Error Log :
Output from mochad-0.1.15-r0@armv7a_vfp_neon:
| error: unpacking of archive failed on file /etc/init.d: cpio: rename failed - Resource temporarily unavailable

Signed-off-by: Baptiste DURAND <baptiste.durand@gmail.com>
Fix Image Creation issue : Increase Rootfs Size

Signed-off-by: Baptiste DURAND <baptiste.durand@gmail.com>