Replace remaining IS_ENABLED(CONFIG_*) with CONFIG()

Another run of
  find src/ -type f | xargs sed -i -e 's/IS_ENABLED\s*(CONFIG_/CONFIG(/g'

Change-Id: I3243197ab852a3fbc3eb2e2e782966a350b78af2
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32224
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/include/symbols.h

@@ -71,7 +71,7 @@ DECLARE_REGION(bl31)
  * (Does not necessarily mean that the memory is accessible.) */
 static inline int preram_symbols_available(void)
 {
-	return !IS_ENABLED(CONFIG_CACHE_AS_RAM) || ENV_CACHE_AS_RAM;
+	return !CONFIG(CACHE_AS_RAM) || ENV_CACHE_AS_RAM;
 }
 
 #endif /* __SYMBOLS_H */