squash! ggml : move rope type enum to ggml.h

This commit removes the enum ggml_rope_type from ggml.h and replaces it
with a define (GGML_ROPE_TYPE_NEOX). This define is used in the code to
check if the mode is set to GPT-NeoX. Also the enum llama_rope_type has
been updated to reflect this change.

include/llama.h

@@ -97,7 +97,7 @@ extern "C" {
 
     enum llama_rope_type {
         LLAMA_ROPE_TYPE_NONE = -1,
-        LLAMA_ROPE_TYPE_NORM = GGML_ROPE_TYPE_NORM,
+        LLAMA_ROPE_TYPE_NORM = 0,
         LLAMA_ROPE_TYPE_NEOX = GGML_ROPE_TYPE_NEOX,
     };