v3dv: provide implementation for CmdSetViewportWithCount

As with CmdSetViewport, we need to provide a custom implementation
because we want to call and save the outcome of viewport_compute_xform
when the viewport is set, not during emission.

We can just call v3dv_CmdSetViewport, as that one is already calling
vk_common_SetViewportWithCount.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27609>

src/broadcom/vulkan/v3dv_cmd_buffer.c

@@ -2272,6 +2272,14 @@ v3dv_CmdSetViewport(VkCommandBuffer commandBuffer,
    }
 }
 
+VKAPI_ATTR void VKAPI_CALL
+v3dv_CmdSetViewportWithCount(VkCommandBuffer commandBuffer,
+                             uint32_t viewportCount,
+                             const VkViewport *pViewports)
+{
+   v3dv_CmdSetViewport(commandBuffer, 0, viewportCount, pViewports);
+}
+
 /* We keep a custom CmdSetScissor because we need to set the scissor
  * count. This is specially relevant to our case because we are
  * pushing/popping the dynamic state as part of the meta operations.