Add qnn deps to LlamaDemo gradle

Author: kirklandsign

examples/demo-apps/android/LlamaDemo/app/build.gradle.kts

@@ -11,6 +11,8 @@ plugins {
   id("org.jetbrains.kotlin.android")
 }
 
+def qnnVersion = System.properties['qnnVersion']
+
 android {
   namespace = "com.example.executorchllamademo"
   compileSdk = 34
@@ -61,6 +63,9 @@ dependencies {
   implementation("com.google.android.material:material:1.12.0")
   implementation("androidx.activity:activity:1.9.0")
   implementation("org.json:json:20250107")
+  if (qnnVersion) {
+    implementation "com.qualcomm.qti:qnn-runtime:$qnnVersion"
+  }
   testImplementation("junit:junit:4.13.2")
   androidTestImplementation("androidx.test.ext:junit:1.1.5")
   androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")