Remove include for log/log.h in l2c_main.cc

* log/log.h is not supported by linux build and is handled by
  osi/include/log.h
* Thus, it shouldn't be included in l2c_main.cc, which breaks the linux
  build

Test: make on both linux and Android, no functional effect
Change-Id: I0c974b754b43d7b73adea2a91078b85e22b3b14e