[lldb][Process/FreeBSDKernelCore] Switch to LLDBLog::Process (#191408)
Failure to read all required fields for msgbuf isn't ObjectFile's fault
but FreeBSD-Kernel-Core plugin specific. Thus this should be logged
through `LLDBLog::Process` rather than `LLDBLog::Object`.
Signed-off-by: Minsoo Choo <minsoochoo0122@proton.me>