demmt/nvrm: delete dead code
demmt/nvrm: RE bits of ioctl 0x34

It seems to be "create object and do something with 2nd object" op.
demmt/nvrm: maintain objects hierarchy and annotate object handles
demmt/nvrm: annotate mthd_fifo_ib_object_info.hwclass
demmt/nvrm: describe driver object classes

nvrm_object.xml was generated from gdev:nvrm/nvrm_class.h (author:
Marcin Kościelnicki <koriakin@0x04.net>)
demmt/nvrm: deal with paddings

- rename fields which are always 0 in my traces to _pad*
- rename fields marked as paddings which are sometimes != 0 to unk*
- print fields marked as paddings when they are != 0