v3dv/device: expose support for image cube array

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 c897e6e..046c58c 100644
--- a/src/broadcom/vulkan/v3dv_device.c
+++ b/src/broadcom/vulkan/v3dv_device.c
@@ -574,7 +574,7 @@
    *pFeatures = (VkPhysicalDeviceFeatures) {
       .robustBufferAccess = true, /* This feature is mandatory */
       .fullDrawIndexUint32 = false,
-      .imageCubeArray = false,
+      .imageCubeArray = true,
       .independentBlend = false,
       .geometryShader = false,
       .tessellationShader = false,