Update required cmake version to 3.5.1 to support rpm packages.

Change-Id: Ic8d0d96b131937407de2578a653025a44843d330


[ROCm/ROCR-Runtime commit: cfc949c1ee]

projects/rocr-runtime/runtime/packages/hsa-ext-rocr-dev/CMakeLists.txt

@@ -40,7 +40,7 @@
 ##
 ################################################################################
 
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.5.1)
 
 set ( PROJECT_STRING hsa-ext-rocr-dev )
 

projects/rocr-runtime/runtime/packages/hsa-rocr-dev/CMakeLists.txt

@@ -40,7 +40,7 @@
 ##
 ################################################################################
 
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.5.1)
 
 set ( PROJECT_STRING hsa-rocr-dev )