cmake: Do not warn on deprecated symbols w CONFIG_WARN_DEPRECATED=n

CONFIG_WARN_DEPRECATED is 'y' by default.
When a user actively disables CONFIG_WARN_DEPRECATED, one would expect
that they would stop getting all deprecation warnings, not just the
ones from kconfig.
Otherwise users continue getting tons of these warnings when building
deprecated functionality.

So let's indeed disable them also for symbols and macros.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

CMakeLists.txt

@@ -166,7 +166,7 @@ if(CONFIG_COMPILER_WARNINGS_AS_ERRORS)
   zephyr_link_libraries($<TARGET_PROPERTY:linker,warnings_as_errors>)
 endif()
 
-if(CONFIG_DEPRECATION_TEST)
+if(CONFIG_DEPRECATION_TEST OR NOT CONFIG_WARN_DEPRECATED)
   zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,no_deprecation_warning>>)
   zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler,no_deprecation_warning>>)
   zephyr_compile_options($<$<COMPILE_LANGUAGE:ASM>:$<TARGET_PROPERTY:asm,no_deprecation_warning>>)

Kconfig.zephyr

@@ -1021,7 +1021,8 @@ config WARN_DEPRECATED
 	prompt "Warn on deprecated usage"
 	help
 	  Print a warning when the Kconfig tree is parsed if any deprecated
-	  features are enabled.
+	  features are enabled, or at compile time, when deprecated macros or
+	  symbols are used.
 
 config EXPERIMENTAL
 	bool

include/zephyr/toolchain/gcc.h

@@ -349,7 +349,7 @@ do {                                                                    \
 #define __WARN1(s) _Pragma(#s)
 
 /* Generic message */
-#ifndef CONFIG_DEPRECATION_TEST
+#if !(defined(CONFIG_DEPRECATION_TEST) || !defined(CONFIG_WARN_DEPRECATED))
 #define __DEPRECATED_MACRO __WARN("Macro is deprecated")
 /* When adding this, remember to follow the instructions in
  * https://docs.zephyrproject.org/latest/develop/api/api_lifecycle.html#deprecated

include/zephyr/toolchain/iar/iccarm.h

@@ -248,7 +248,7 @@ do {                                                                    \
 #define __WARN1(s) __PRAGMA(message = #s)
 
 /* Generic message */
-#ifndef CONFIG_DEPRECATION_TEST
+#if !(defined(CONFIG_DEPRECATION_TEST) || !defined(CONFIG_WARN_DEPRECATED))
 #define __DEPRECATED_MACRO __WARN("Macro is deprecated")
 #else
 #define __DEPRECATED_MACRO