Remove backend initialization from __hipRegisterFatBinary

[pvelesko]

extern "C" void **__hipRegisterFatBinary(const void *Data) {
  CHIP_TRY
  // Increment before calling potentially exception throwing functions.
  CHIPNumRegisteredFatBinaries++;

  logDebug("__hipRegisterFatBinary");

  // NOTE: CHIP backend initialization is undesired here. This is done
  //       for avoiding start-up lag and other unexpected issues that
  //       may come from the backend before a client makes any HIP API
  //       function call.

  // FIXME: There are segfaults that occur sometimes at program exit
  //        in some cases (e.g. in Unit_hipStreamPerThread_DeviceReset_1 test
  //        case) and they go away if we have the CHIP runtime initialized
  //        early. Should find the causes, fix them and then and then remove the
  //        CHIPInitialize() call.
  LOCK(ApiMtx);