cmake: make formatting of install statements follow one pattern

Change-Id: Ib7d571af629b0af78397a411b0cca409a6d218d8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e8d7ef0..2231bc3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -175,6 +175,8 @@
 # Install cmake search helper for this library
 ########################################################################
 
-install(FILES cmake/Modules/gr-gsmConfig.cmake
+install(
+    FILES
+    cmake/Modules/gr-gsmConfig.cmake
     DESTINATION ${CMAKE_MODULES_DIR}/grgsm
 )