Add line in trilinos/stk configuration to enable stk_ngp package. (#9082)

The Trilinos/stk configuration is pretty Nalu specific right
now (and is acknowledged as such in a comment in package.py), and
this commit enables a module that Nalu will be needing.

var/spack/repos/builtin/packages/trilinos/package.py

@@ -431,6 +431,7 @@ def cmake_args(self):
             # They can likely change when necessary in the future
             options.extend([
                 '-DTrilinos_ENABLE_STKMesh:BOOL=ON',
+                '-DTrilinos_ENABLE_STKNGP:BOOL=ON',
                 '-DTrilinos_ENABLE_STKSimd:BOOL=ON',
                 '-DTrilinos_ENABLE_STKIO:BOOL=ON',
                 '-DTrilinos_ENABLE_STKTransfer:BOOL=ON',