Remove -dev make instructions

These are removed now that we've consolidated the dev package
information into CMakeLists.txt from hsakmt-dev.txt.

Change-Id: I49496ec5def85b0af7fa6b15110910528a8e0be0


[ROCm/ROCR-Runtime commit: 654ee83ac8]

projects/rocr-runtime/README.md

@@ -29,14 +29,14 @@ If the hsakmt-roct and hsakmt-roct-dev packages are desired:
     cd build
     cmake ..
     make package
-    make package-dev
 ```
 If you choose not to build and install packages, manual installation of the binaries and header files can be done via:
 ```bash
     make install
-    make install-dev
 ```
 
+NOTE: For older versions of the thunk where hsakmt-dev.txt is present, "make package-dev" and "make install-dev" are required to generate/install the developer packages. Currently, these are created via the "make package" and "make install" commands
+
 #### Disclaimer
 
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