drm/tyr: Clarify driver/device type names

drm/tyr: Clarify driver/device type names

Currently the `TyrDriver` struct implements both `platform::Driver` and
`drm::Driver`. For clarity, split up these two roles:
 - Introduce `TyrPlatformDriverData` to implement `platform::Driver`, and
 - Introduce `TyrDrmDriver` to implement `drm::Driver`.

Also rename other variables to reflect their roles in the DRM context:
- Rename `TyrDevice` to `TyrDrmDevice`
- Rename `TyrData` to `TyrDrmDeviceData`
- Rename `File` to `TyrDrmFileData`
- Rename `DrmFile` to `TyrDrmFile`

No functional changes are intended.

Co-developed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Link: https://patch.msgid.link/20260224002314.344675-1-deborah.brouwer@collabora.com
Signed-off-by: Alice Ryhl <aliceryhl@google.com>