v3dv: declare that we support robust buffer access

This is actually mandatory for any implementation so there is no
point in not supporting it.

This probably doesn't work yet and we might need to patch the
compiler to emit bounds testing code for TMU accesses.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
diff --git a/src/broadcom/vulkan/v3dv_device.c b/src/broadcom/vulkan/v3dv_device.c
index ce242eb..4f4b8d7 100644
--- a/src/broadcom/vulkan/v3dv_device.c
+++ b/src/broadcom/vulkan/v3dv_device.c
@@ -536,7 +536,7 @@
    memset(pFeatures, 0, sizeof(*pFeatures));
 
    *pFeatures = (VkPhysicalDeviceFeatures) {
-      .robustBufferAccess = false,
+      .robustBufferAccess = true, /* This feature is mandatory */
       .fullDrawIndexUint32 = false,
       .imageCubeArray = false,
       .independentBlend = false,