[hwasan] Remove liblog dependency.

HWASan will not run on older Android releases where we use
__android_log_write for logging.

This dependency is also harmful in the case when libc itself depends
on hwasan, because it creates a loop of
  libc -> hwasan -> liblog -> libc
which makes liblog vs libc initialization order undetermined.

Without liblog the loop is just
  libc -> hwasan -> libc
and any init order issues can be solved in hwasan.

llvm-svn: 339449