seccomp: x86_64: Allow fstat for video device
seccomp: x86_64: Allow fstat for video device

libvda depends minigbm, on amdgpu, minigbm calls dri_init
to check GPU type. dri_init calls drmGetRenderDeviceNameFromFd
in libdrm which calls fstat.

BUG=b:161376212
TEST=manual - Run arcvm on grunt

Change-Id: I3dcb723711030d25e85cf3cac4cc7c66e0e2077f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2301439
Commit-Queue: Lepton Wu <98fe55dd9d3c1cbbf1dc9faf0be9e8ebf7fc5bb6@chromium.org>
Commit-Queue: Chirantan Ekbote <35787c0e27de5c48735e07f8324823b765e8bcbc@chromium.org>
Tested-by: Lepton Wu <98fe55dd9d3c1cbbf1dc9faf0be9e8ebf7fc5bb6@chromium.org>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Auto-Submit: Lepton Wu <98fe55dd9d3c1cbbf1dc9faf0be9e8ebf7fc5bb6@chromium.org>
Reviewed-by: Chirantan Ekbote <35787c0e27de5c48735e07f8324823b765e8bcbc@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm