[K/N][samples] Properly disable HMPP for ^KT-50547

Properties file inside subproject isn't read. Moved to root
Fixup to 8d0b511e95

kotlin-native/samples/echoServer/gradle.properties

@@ -1,6 +1,2 @@
 kotlin.code.style=official
 kotlin.import.noCommonSourceSets=true
-
-# Disable HMPP with metadata until KT-50547 is not fixed
-kotlin.mpp.enableGranularSourceSetsMetadata=false
-kotlin.mpp.hierarchicalStructureSupport=false

kotlin-native/samples/gradle.properties

@@ -15,4 +15,7 @@ kotlin_version=1.6.0
 kotlin.native.home=../../dist
 
 # Increase memory for in-process compiler execution.
-org.gradle.jvmargs=-Xmx3g
+org.gradle.jvmargs=-Xmx3g
+
+# Disable HMPP with metadata until KT-50547 is not fixed
+kotlin.mpp.hierarchicalStructureSupport=false