drm/xe: vram addr range is expanded to bit[17:8]

drm/xe: vram addr range is expanded to bit[17:8]

The bit field used to be [14:8] with [17:15] marked as SPARE and
defaulted to 0. So, simply expand the read to bit[17:8] assuming
the platforms using only bit[14:8] have zeros in the expanded bits.

BSpec: 54991

Signed-off-by: Fei Yang <fei.yang@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260112220330.2267122-2-fei.yang@intel.com