Add llama 3.2 model type on Android (#5646)

Summary:
Pull Request resolved: pytorch/executorch#5646

Adding 3.2 model type on android app

Reviewed By: kirklandsign

Differential Revision: D63404583

fbshipit-source-id: 57c79b120b11cd6a814cf56107c76165fdf04f91

Author: Riandy

examples/demo-apps/android/LlamaDemo/app/src/main/java/com/example/executorchllamademo/ModelType.java

@@ -11,6 +11,7 @@
 public enum ModelType {
   LLAMA_3,
   LLAMA_3_1,
+  LLAMA_3_2,
   LLAVA_1_5,
   LLAMA_GUARD_3,
 }

examples/demo-apps/android/LlamaDemo/app/src/main/java/com/example/executorchllamademo/ModelUtils.java

@@ -21,6 +21,7 @@ public static int getModelCategory(ModelType modelType) {
         return VISION_MODEL;
       case LLAMA_3:
       case LLAMA_3_1:
+      case LLAMA_3_2:
       default:
         return TEXT_MODEL;
     }

examples/demo-apps/android/LlamaDemo/app/src/main/java/com/example/executorchllamademo/PromptFormat.java

@@ -19,6 +19,7 @@ public static String getSystemPromptTemplate(ModelType modelType) {
     switch (modelType) {
       case LLAMA_3:
       case LLAMA_3_1:
+      case LLAMA_3_2:
         return "<|begin_of_text|><|start_header_id|>system<|end_header_id|>\n"
             + SYSTEM_PLACEHOLDER
             + "<|eot_id|>";
@@ -33,6 +34,7 @@ public static String getUserPromptTemplate(ModelType modelType) {
     switch (modelType) {
       case LLAMA_3:
       case LLAMA_3_1:
+      case LLAMA_3_2:
       case LLAMA_GUARD_3:
         return "<|start_header_id|>user<|end_header_id|>\n"
             + USER_PLACEHOLDER
@@ -49,6 +51,7 @@ public static String getConversationFormat(ModelType modelType) {
     switch (modelType) {
       case LLAMA_3:
       case LLAMA_3_1:
+      case LLAMA_3_2:
         return getUserPromptTemplate(modelType) + "\n" + ASSISTANT_PLACEHOLDER + "<|eot_id|>";
       case LLAVA_1_5:
         return USER_PLACEHOLDER + " ASSISTANT:";
@@ -61,6 +64,7 @@ public static String getStopToken(ModelType modelType) {
     switch (modelType) {
       case LLAMA_3:
       case LLAMA_3_1:
+      case LLAMA_3_2:
       case LLAMA_GUARD_3:
         return "<|eot_id|>";
       case LLAVA_1_5: