wsl/hsakmt: Add clear_allocation_map

If fork() is called, clear allocation map
that is invalid in the child process.

Signed-off-by: lyndonli <Lyndon.Li@amd.com>
Reviewed-by: Shi.Leslie Yuliang.Shi@amd.com
Part-of: <http://10.67.69.192/wsl/libhsakmt/-/merge_requests/3>

openclose.cpp

@@ -96,7 +96,7 @@ static void child_fork_handler(void) {
  * in the child process so it is not cleared
  */
 static void clear_after_fork(void) {
-  // TODO: fmm_clear_all_mem();
+  clear_allocation_map();
   if (dxg_fd) {
     close(dxg_fd);
     dxg_fd = -1;