added ppossibility to build Ultimate 64 ROM with CRT image

src/,,config_generic_crt.s

@@ -1,5 +1,5 @@
 
-;; #CONFIG# ID $02 ; should be 1 byte, different for each config file!
+;; #CONFIG# ID $11 ; should be 1 byte, different for each config file!
 
 ;
 ; Please read CONFIG.md before modifying this file!
@@ -15,6 +15,7 @@
 ; --- Hardware platform and brand
 
 ;; #CONFIG# PLATFORM_COMMODORE_64      YES
+;; #CONFIG# ROM_CRT                    YES
 ;; #CONFIG# BRAND_GENERIC_CRT          YES