Fix CSR query issue to enable new CSR protocal

Author: ericxu233

src/acl_kernel_if.cpp

@@ -1052,6 +1052,8 @@ int acl_kernel_if_post_pll_config_init(acl_kernel_if *kern) {
       // Register addresses are pushed back since previous versions
       // doesn't have the start register
       kern->cra_address_offset = 0;
+    } else {
+      kern->cra_address_offset = 8;
     }
   } else {
     kern->csr_version = 0;