SWDEV-470372 - Added hipExtHostAlloc API

This change adds a new HIP API `hipExtHostAlloc` which preserves
the functionality of `hipHostMalloc`.

Change-Id: I13504c6fc13465ddd7aed329795bb4f2fef1baff

hipamd/src/hip_hcc.map.in

@@ -578,3 +578,10 @@ global:
 local:
     *;
 } hip_6.1;
+
+hip_6.3 {
+global:
+    hipExtHostAlloc;
+local:
+    *;
+} hip_6.2;