Selective fetch Y position differs when Region Early Transport is
used. Use formula from Bspec for this.

Bspec: 68927
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240529093849.1016172-5-jouni.hogander@intel.com