Replace period_ms_t with uint64_t

* There is no need to define a unit for millisecond in our system since
  uint64_t is the largest integer that is supported
* period_ms_t results in many unnecessary dependency on
  osi/include/time.h
* Used text editor to do the directory wise replacement, basically
    sed -i 's/period_ms_t/uint64_t/g' *
* Need to modify several method and variable names to indicate that they
  are using millisecond as time unit

Bug: 110303473
Test: build, no functional change as period_ms_t was a typedef of
      uint64_t

Change-Id: I497c9a146a97bab7c7477b358847dad958b92034