drm: xlnx: zynqmp_dpsub: Fix kernel doc

Fix two kernel doc warnings introduced by the recent DP audio patch:

- Add a doc line for the new "audio" field
- Remove a reference to zynqmp_dpsub.c from zynqmp.rst, as the .c file
no longer has structured comments

Fixes: 3ec5c1579305 ("drm: xlnx: zynqmp_dpsub: Add DP audio support")
Closes: https://lore.kernel.org/all/[e-mail]/
Reviewed-by: Vishal Sagar <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
(cherry picked from commit 96b5d2e807f667320c66f41ddc1c473023a73ab2)
Signed-off-by: Maxime Ripard <[e-mail]>

Documentation/gpu/zynqmp.rst

···
 
 .. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_dp.c
 
-.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_dpsub.c
-
 .. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_kms.c

drivers/gpu/drm/xlnx/zynqmp_dpsub.h

···
  * @layers: Video and graphics layers
  * @dp: The DisplayPort controller
  * @dma_align: DMA alignment constraint (must be a power of 2)
+ * @audio: DP audio data
  */
 struct zynqmp_dpsub {
 	struct device *dev;