Added support for Viking pre-tokenizer (#8135)

Co-authored-by: kustaaya <kustaaya@protonmail.com>

include/llama.h

@@ -88,6 +88,7 @@ extern "C" {
         LLAMA_VOCAB_PRE_TYPE_DBRX           = 13,
         LLAMA_VOCAB_PRE_TYPE_SMAUG          = 14,
         LLAMA_VOCAB_PRE_TYPE_PORO           = 15,
+        LLAMA_VOCAB_PRE_TYPE_VIKING         = 16,
     };
 
     // note: these values should be synchronized with ggml_rope