Tests: Fix VSNsightTegra test on Android NDK r12b

Test with architecture `armv7-a` instead of `armv7-a-hard` because the
latter is supporte supported only with NDK revisions r9c to r11c.

Tests/VSNsightTegra/CMakeLists.txt

 cmake_minimum_required(VERSION 3.3)
 project(VSNsightTegra C CXX)
 
-set(CMAKE_ANDROID_ARCH armv7-a-hard)
+set(CMAKE_ANDROID_ARCH armv7-a)
 set(CMAKE_ANDROID_STL_TYPE stlport_shared)
 set(CMAKE_ANDROID_API_MIN 9)
 set(CMAKE_ANDROID_API 15)