cmake: Rename CMake variable out of the reserved CONFIG_ namespace

Rename the poorly named CMake variable 'CONFIG_LIST' to
'LIST_OF_CONFIGS' to take it out of the Kconfig-reserved namespace
'CONFIG_*'.

This is a small step towards resolving #12144

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>

misc/generated/CMakeLists.txt

@@ -2,11 +2,11 @@ set(CONFIGS_C ${CMAKE_CURRENT_BINARY_DIR}/misc/generated/configs.c)
 
 file(STRINGS
   ${AUTOCONF_H}
-  CONFIG_LIST
+  LIST_OF_CONFIGS
   REGEX "^#define CONFIG_"
   ENCODING "UTF-8"
   )
-foreach (CONFIG ${CONFIG_LIST})
+foreach (CONFIG ${LIST_OF_CONFIGS})
   string(REGEX REPLACE "#define (CONFIG_[A-Z|_|0-9]*) (.*)" "GEN_ABSOLUTE_SYM(\\1, \\2)" CONFIG ${CONFIG})
   string(REGEX REPLACE "\"(.*)\"" "1" CONFIG ${CONFIG})
   set(GEN_ABS_SYM_LIST "${GEN_ABS_SYM_LIST}${CONFIG};\n")