intel: add intel_{alloc,free,logv,log}()

They are per-instance equivalents of icd_{alloc,free,logv,log}().  They also
require us to embed a pointer to icd_instance in intel_handle.
diff --git a/icd/intel/instance.c b/icd/intel/instance.c
index 6c6f061..1564e02 100644
--- a/icd/intel/instance.c
+++ b/icd/intel/instance.c
@@ -128,7 +128,7 @@
     }
 
     memset(instance, 0, sizeof(*instance));
-    intel_handle_init(&instance->handle, XGL_DBG_OBJECT_INSTANCE);
+    intel_handle_init(&instance->handle, XGL_DBG_OBJECT_INSTANCE, icd);
 
     instance->icd = icd;