fix typo
remove duplicated code

its already present in common to all init.usb.rc
update dhcp client services

Update based on mr0 and mr1.

 a - Remove route setup from dhcp
     The connectivity service takes care and now we need this to do
     ARP verification
 D - Add CLIENTID request to dhcpcd service

Original author: Vishal Mahaveer <a0271468@ti.com>