'grep' is used for parsing the current IP address, but grep is not
presented in ramdisk-recovery image basically. To this end, this adds
grep into the list for ramdisk-recovery image creation.
Change-Id: Id208ef8e9dde428daf2ded22a3e0fc0d8dec8610 Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>