freedreno: Add missing generated header dependency

freedreno: Add missing generated header dependency

Fixes:

  In file included from ../mesa-freedreno-22.0.0_pre/src/gallium/drivers/freedreno/ir3/ir3_cmdline.c:45:
  In file included from ../mesa-freedreno-22.0.0_pre/src/gallium/drivers/freedreno/ir3/ir3_gallium.h:34:
  In file included from ../mesa-freedreno-22.0.0_pre/src/gallium/drivers/freedreno/freedreno_util.h:31:
  ../mesa-freedreno-22.0.0_pre/src/freedreno/drm/freedreno_ringbuffer.h:35:10: fatal error: 'adreno_common.xml.h' file not found
  #include "adreno_common.xml.h"
           ^~~~~~~~~~~~~~~~~~~~~
  1 error generated.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14735>