InternalHciCallbacks: log error code

I was hitting this in a loop when looking at certain system
stability issues.

I'd recommend switching all the ASSERT calls to the
CHECK_* libbase APIs which include a print. Note - CHECK_* errors
are unconditionally enabled.

Bug: 262483403
Test: repro error, see issue
Change-Id: I7d39e4b3c1ae7744131229355a019727a096005e