drm/v3d: Add V3D tech revision to the device information

The V3D tech revision can be a useful information when configuring
jobs. Therefore, expose it in the `struct v3d_dev` with the V3D tech
version.

Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240714145243.1223131-1-mcanal@igalia.com