Fix phone is sometimes in America/Dawson canadian time zone

Add code that updates the time zone whenever the country code
or time zone changes. In bug 6269708 the device initially
reported the mcc as 001 and then a short time later it got
the correct code, 311. This could cause the time zone to be
reported as America/Dawson instead of America/Los_Angeles.

Bug: 6269708
Change-Id: Ibfb40ea1158d3b99c121ed9960a1f0b1a45980bd