drm/tyr: rename TyrObject to BoData

drm/tyr: rename TyrObject to BoData

Currently the GEM inner driver data object is called `TyrObject` which
is a fairly generic name. To make the code easier to understand,
rename `TyrObject` to `BoData` so that the name better reflects its
role.

No functional change is intended.

Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Co-developed-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Link: https://patch.msgid.link/20260428-fw-boot-prerequisites-v1-2-c69af9abe1af@collabora.com
Signed-off-by: Alice Ryhl <aliceryhl@google.com>