Telephony: Avoid Infinite loop problem in Tethering

1. Whenever data is enabled we will try to establish the tethered
call (USB tethering enabled case) for 5 fixed number of retries.
After reaching maximum number of retries we are turning off the
upstream connection. whenever the CONNECTIVTY_ACTION received
(because of USB cable disconnected and then connected case or
some changes), it can try to bring up the dun/hipri PDP again.

2. There is no retry in case of data disabled case.

Change-Id: I16af4d2983a8bf9ce0ce904877f86169bca549b4
CRs-Fixed: 401829
(cherry picked from commit 4c923c8537fdc49ef491b964adc1871c77bfd730)
(cherry picked from commit 3135e6a89ac14008df04fe6e068bd8dd95b4ee40)
(cherry picked from commit 137b7004f716a559c7249be20e25544fe10330b6)