intel: make intel_base_dbg_create() more useful

Allow the allocation size to be specified for intel_base_dbg_create().  This
makes it reusable for creating intel_base_dbg subclasses.

intel_base_dbg_init() and intel_base_dbg_cleanup() are removed.
diff --git a/icd/intel/mem.c b/icd/intel/mem.c
index 4c0ccee..c887a8e 100644
--- a/icd/intel/mem.c
+++ b/icd/intel/mem.c
@@ -43,8 +43,8 @@
 
     mem->base.dispatch = dev->base.dispatch;
     if (dev->base.dbg) {
-        mem->base.dbg =
-            intel_base_dbg_create(XGL_DBG_OBJECT_GPU_MEMORY, NULL, 0);
+        mem->base.dbg = intel_base_dbg_create(XGL_DBG_OBJECT_GPU_MEMORY,
+                NULL, 0, 0);
         if (!mem->base.dbg) {
             intel_mem_free(mem);
             return XGL_ERROR_OUT_OF_MEMORY;