intel: implement descriptor set functions

Descriptor sets live in system memory.  We wanted to use a bo, but
BINDING_TABLE_STATE is unknown yet and SAMPLER_STATE should live elsewhere.
diff --git a/icd/intel/dispatch_tables.c b/icd/intel/dispatch_tables.c
index 1f0bc05..f9a8549 100644
--- a/icd/intel/dispatch_tables.c
+++ b/icd/intel/dispatch_tables.c
@@ -24,6 +24,7 @@
 
 #include "icd.h"
 #include "dev.h"
+#include "dset.h"
 #include "event.h"
 #include "fence.h"
 #include "format.h"
@@ -193,63 +194,6 @@
     return XGL_ERROR_UNAVAILABLE;
 }
 
-static XGL_RESULT XGLAPI intelCreateDescriptorSet(
-    XGL_DEVICE                                  device,
-    const XGL_DESCRIPTOR_SET_CREATE_INFO*       pCreateInfo,
-    XGL_DESCRIPTOR_SET*                         pDescriptorSet)
-{
-    return XGL_ERROR_UNAVAILABLE;
-}
-
-static XGL_VOID XGLAPI intelBeginDescriptorSetUpdate(
-    XGL_DESCRIPTOR_SET                          descriptorSet)
-{
-}
-
-static XGL_VOID XGLAPI intelEndDescriptorSetUpdate(
-    XGL_DESCRIPTOR_SET                          descriptorSet)
-{
-}
-
-static XGL_VOID XGLAPI intelAttachSamplerDescriptors(
-    XGL_DESCRIPTOR_SET                          descriptorSet,
-    XGL_UINT                                    startSlot,
-    XGL_UINT                                    slotCount,
-    const XGL_SAMPLER*                          pSamplers)
-{
-}
-
-static XGL_VOID XGLAPI intelAttachImageViewDescriptors(
-    XGL_DESCRIPTOR_SET                          descriptorSet,
-    XGL_UINT                                    startSlot,
-    XGL_UINT                                    slotCount,
-    const XGL_IMAGE_VIEW_ATTACH_INFO*           pImageViews)
-{
-}
-
-static XGL_VOID XGLAPI intelAttachMemoryViewDescriptors(
-    XGL_DESCRIPTOR_SET                          descriptorSet,
-    XGL_UINT                                    startSlot,
-    XGL_UINT                                    slotCount,
-    const XGL_MEMORY_VIEW_ATTACH_INFO*          pMemViews)
-{
-}
-
-static XGL_VOID XGLAPI intelAttachNestedDescriptors(
-    XGL_DESCRIPTOR_SET                          descriptorSet,
-    XGL_UINT                                    startSlot,
-    XGL_UINT                                    slotCount,
-    const XGL_DESCRIPTOR_SET_ATTACH_INFO*       pNestedDescriptorSets)
-{
-}
-
-static XGL_VOID XGLAPI intelClearDescriptorSetSlots(
-    XGL_DESCRIPTOR_SET                          descriptorSet,
-    XGL_UINT                                    startSlot,
-    XGL_UINT                                    slotCount)
-{
-}
-
 static XGL_RESULT XGLAPI intelCreateViewportState(
     XGL_DEVICE                                  device,
     const XGL_VIEWPORT_STATE_CREATE_INFO*       pCreateInfo,