APPLE: Fix CPU culling in PipelineDrawBatch

[creijon]

Description of Change(s)

When using HdSt_PipelineDrawBatch, the logic in HdSt_RenderPass was not checking that it had GPU culling disabled and therefore the CPU frustum culling was not being used.

We now check the flag for both HdSt_IndirectDrawBatch and HdSt_PipelineDrawBatch depending on what is enabled.

Fixes Issue(s)

• There was no frustum culling on the HdSt_PipelineDrawBatch, since the GPU culling isn't implemented yet. CPU culling was not being enabled in its place.
• Tested by loading KitchenSet, moving camera into the scene and then using the HD_FREEZE_CULL_FRUSTUM debug option in usdView. Trucking the camera back should show that only the primitives within the frozen frustum are visible.

• I have submitted a signed Contributor License Agreement

[sunyab]

Filed as internal issue #USD-7503