hipHostMalloc allocation are mapped to all devices by default.

Support hipHostMallocPortable flag.
Default flags are hipHostMallocPortable | hipHostMallocMapped.

Also:
-refactor tests to move addCount and addCountReverse into HipTest
namespace.
-test multi-GPU host memory.

hipamd/tests/src/hipPointerAttrib.cpp

@@ -99,7 +99,7 @@ inline int zrand(int max)
 
 
 //=================================================================================================
-// Functins to run tests
+// Functions to run tests
 //=================================================================================================
 //--
 //Run through a couple simple cases to test lookups and host pointer arithmetic: