Update README

find_package() should not be passed a namespace.

Change-Id: I36e99da144f3123385cda6cc9c7bbda7b2013b73


[ROCm/ROCR-Runtime commit: ed1c63877c]

projects/rocr-runtime/runtime/hsa-runtime/README.md

@@ -110,7 +110,7 @@ runtime may locate, include, and link the runtime with the following template:
 
     Add /opt/rocm to CMAKE_PREFIX_PATH.
 
-    find_package(hsa-runtime64::hsa-runtime64 1.0 REQUIRED)
+    find_package(hsa-runtime64 1.0 REQUIRED)
     ...
     add_library(Foo ...)
     ...