freedreno: set modifier when exporting buffer

freedreno: set modifier when exporting buffer

Fixes an assert we start hitting with kms/gbm:

  #0  0x0000007fbf3d6e3c in raise () from /lib64/libc.so.6
  #1  0x0000007fbf3c4a68 in abort () from /lib64/libc.so.6
  #2  0x0000007fbf3d04e8 in __assert_fail_base () from /lib64/libc.so.6
  #3  0x0000007fbf3d0550 in __assert_fail () from /lib64/libc.so.6
  #4  0x0000007fbf5a73c4 in gbm_dri_bo_create (gbm=0x5820f0, width=2160, height=1440, format=875713112, usage=0, modifiers=0x695e00, count=1) at ../src/gbm/backends/dri/gbm_dri.c:1150
  #5  0x0000007fbf5a49c4 in gbm_bo_create_with_modifiers (gbm=0x5820f0, width=2160, height=1440, format=875713112, modifiers=0x695e00, count=1) at ../src/gbm/main/gbm.c:491
  #6  0x0000007fbbac3d64 in get_back_bo (dri2_surf=0x6f4cc0) at ../src/egl/drivers/dri2/platform_drm.c:258
  #7  0x0000007fbbac4318 in dri2_drm_image_get_buffers (driDrawable=0x704490, format=4098, stamp=0x6fc730, loaderPrivate=0x6f4cc0, buffer_mask=1, buffers=0x7fffffe210) at ../src/egl/drivers/dri2/platform_drm.c:409
  #8  0x0000007fbf5a5318 in image_get_buffers (driDrawable=0x704490, format=4098, stamp=0x6fc730, loaderPrivate=0x70e150, buffer_mask=1, buffers=0x7fffffe210) at ../src/gbm/backends/dri/gbm_dri.c:135
  #9  0x0000007fbe4308c4 in dri_image_drawable_get_buffers (drawable=0x6fc730, images=0x7fffffe210, statts=0x6f2660, statts_count=1) at ../src/gallium/state_trackers/dri/dri2.c:339
  #10 0x0000007fbe430c44 in dri2_allocate_textures (ctx=0x614b30, drawable=0x6fc730, statts=0x6f2660, statts_count=1) at ../src/gallium/state_trackers/dri/dri2.c:466
  #11 0x0000007fbe435580 in dri_st_framebuffer_validate (stctx=0x714160, stfbi=0x6fc730, statts=0x6f2660, count=1, out=0x7fffffe3b8) at ../src/gallium/state_trackers/dri/dri_drawable.c:85
  #12 0x0000007fbe7b2c84 in st_framebuffer_validate (stfb=0x6f2190, st=0x714160) at ../src/mesa/state_tracker/st_manager.c:222
  #13 0x0000007fbe7b4884 in st_api_make_current (stapi=0x7fbf0430d8 <st_gl_api>, stctxi=0x714160, stdrawi=0x6fc730, streadi=0x6fc730) at ../src/mesa/state_tracker/st_manager.c:1074
  #14 0x0000007fbe434f44 in dri_make_current (cPriv=0x703c20, driDrawPriv=0x704490, driReadPriv=0x704490) at ../src/gallium/state_trackers/dri/dri_context.c:301
  #15 0x0000007fbe42c910 in driBindContext (pcp=0x703c20, pdp=0x704490, prp=0x704490) at ../src/mesa/drivers/dri/common/dri_util.c:579
  #16 0x0000007fbbabab40 in dri2_make_current (drv=0x69d170, disp=0x69c6e0, dsurf=0x6f4cc0, rsurf=0x6f4cc0, ctx=0x70cb40) at ../src/egl/drivers/dri2/egl_dri2.c:1456
  #17 0x0000007fbbaa8ef4 in eglMakeCurrent (dpy=0x69c6e0, draw=0x6f4cc0, read=0x6f4cc0, ctx=0x70cb40) at ../src/egl/main/eglapi.c:862
  #18 0x0000007fbf5736ac in InternalMakeCurrentVendor (dpy=dpy@entry=0x614fb0, draw=draw@entry=0x6f4cc0, read=read@entry=0x6f4cc0, context=context@entry=0x70cb40, apiState=apiState@entry=0x6fc940, vendor=0x6975f0) at libegl.c:861
  #19 0x0000007fbf573764 in InternalMakeCurrentDispatch (dpy=0x614fb0, draw=0x6f4cc0, read=0x6f4cc0, context=0x70cb40, vendor=0x6975f0) at libegl.c:630
  #20 0x0000000000403640 in init_egl (egl=0x5805a8 <gl>, gbm=0x580528 <gbm>, samples=0) at ../common.c:263
  #21 0x0000000000403c1c in init_cube_smooth (gbm=0x580528 <gbm>, samples=0) at ../cube-smooth.c:225
  #22 0x0000000000408618 in main (argc=1, argv=0x7fffffe8d8) at ../kmscube.c:145

Fixes: 1ce5d757d04 freedreno: core buffer modifier support
Signed-off-by: Rob Clark <robdclark@gmail.com>