[cli-sessions] Fix sonic-serial-console.yang model by importing base types.

Author: Ivan Davydenko

src/sonic-yang-models/yang-models/sonic-serial-console.yang

@@ -3,6 +3,9 @@ module sonic-serial-console {
     yang-version 1.1;
     namespace "http://github.com/Azure/sonic-serial-console";
     prefix cli-sessions;
+    import sonic-types {
+        prefix stypes;
+    }
     description "SERIAL_CONSOLE YANG Module for SONiC-based OS";
     revision 2023-06-07 {
         description "First Revision";
@@ -11,21 +14,21 @@ module sonic-serial-console {
         container SERIAL_CONSOLE {
             description "SERIAL_CONSOLE part of config_db.json";
             container POLICIES {
-	            leaf inactivity_timeout {
-	                description "serial-console inactivity-timeout timer value in minutes";
-	                type int32 {
-	                    range "0..35000";
-	                }
-	                default 15;
-	            }
-	
-	            leaf sysrq_capabilities {
-	                description "managing SysRq capabilities";
-	                type stypes:admin_mode;
-	                default disabled;
-	            }
-		}
-		/* end of container POLICIES */
+                leaf inactivity_timeout {
+                    description "serial-console inactivity-timeout timer value in minutes";
+                    type int32 {
+                        range "0..35000";
+                    }
+                    default 15;
+                }
+
+                leaf sysrq_capabilities {
+                    type stypes:admin_mode;
+                    description "managing SysRq capabilities";
+                    default disabled;
+                }
+        }
+        /* end of container POLICIES */
         }
         /* end of container SERIAL_CONSOLE */
     }