Fixes CMake consistency for CLANG toolchain files

Secure side toolchain file was set to CLANG while NS was set to LLVM,
aligned them both to now be CLANG.

Change-Id: I8bc407d37a9d9954f0355dd60a760c46126a4eb3
Signed-off-by: Matthew Dalzell <matthew.dalzell@arm.com>
diff --git a/cmake/install.cmake b/cmake/install.cmake
index f023d1f..e574386 100644
--- a/cmake/install.cmake
+++ b/cmake/install.cmake
@@ -271,7 +271,7 @@
 install(FILES       ${PLATFORM_DIR}/ns/toolchain_ns_GNUARM.cmake
                     ${PLATFORM_DIR}/ns/toolchain_ns_ARMCLANG.cmake
                     ${PLATFORM_DIR}/ns/toolchain_ns_IARARM.cmake
-                    ${PLATFORM_DIR}/ns/toolchain_ns_LLVM.cmake
+                    ${PLATFORM_DIR}/ns/toolchain_ns_CLANG.cmake
         DESTINATION ${INSTALL_CMAKE_DIR})
 
 install(FILES