Update cfg info for slof_hugepage

correct the params' key values which includes 'mem1'
Signed-off-by: NBoqiao Fu <bfu@redhat.com>

qemu/tests/cfg/slof_hugepage.cfg

@@ -12,9 +12,9 @@
     pre_command_noncritical = yes
     free_mem_cmd = free -b | grep -E 'Mem' | awk '{print $2}'
     mem_devs = mem1
-    backend_mem1 = memory-backend-file
-    policy_mem1 = default
-    mem-path_mem1 = /mnt/kvm_hugepage
+    backend_mem_mem1 = memory-backend-file
+    policy_mem_mem1 = default
+    mem-path_mem_mem1 = /mnt/kvm_hugepage
     plug_mem_name = plug
     policy_plug = bind
     mem-path_plug = /mnt/kvm_hugepage
@@ -30,9 +30,9 @@
             # The unit of total_hugepage_size is 'MB'
             total_hugepage_size = 4096
             extra_params += " -mem-path /mnt/kvm_hugepage"
-            size_mem1 = 1G
+            size_mem_mem1 = 1G
             size_plug = 1G
         - without_backing_file_hotplug:
             total_hugepage_size = 8192
-            size_mem1 = 2G
+            size_mem_mem1 = 2G
             size_plug = 2G