[ATOM][RHI][Vulkan][Android] Fix VkValidation copy for new 3rd party system

JIRA: https://jira.agscollab.com/browse/ATOM-15175

cmake/3rdParty/FindVkValidation.cmake

@@ -11,6 +11,5 @@
 
 ly_add_external_target(
     NAME VkValidation
-    VERSION ${VKVALIDATION_VERSION}
-    3RDPARTY_DIRECTORY ${VKVALIDATION_3RDPARTY_PLATFORM_DIRECTORY}
+    VERSION ""
 )

cmake/3rdParty/Platform/Android/VkValidation_android.cmake

@@ -9,4 +9,4 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #
 
-set(VKVALIDATION_RUNTIME_DEPENDENCIES $<$<NOT:$<CONFIG:Release>>:${BASE_PATH}/sources/third_party/vulkan/src/build-android/jniLibs/arm64-v8a/libVkLayer_khronos_validation.so>)
+set(VKVALIDATION_RUNTIME_DEPENDENCIES $<$<NOT:$<CONFIG:Release>>:${LY_NDK_DIR}/sources/third_party/vulkan/src/build-android/jniLibs/arm64-v8a/libVkLayer_khronos_validation.so>)

cmake/3rdParty/cmake_files.cmake

@@ -20,6 +20,5 @@ set(FILES
     FindOpenGLInterface.cmake
     FindOpenSSL.cmake
     FindRadTelemetry.cmake
-    FindVkValidation.cmake
     FindWwise.cmake
 )