issues about YaRN

[foldl]

I am using YaRN when implementing DeepSeek V2 models. And current YaRN does not look good me.

@cebtenzzre Could you take a look on this? Correct me if I am wrong.

1. theta_base *= freq_scale is done again later in rope_yarn:

   https://github.com/ggerganov/ggml/blob/0cbb7c0e053f5419cfbebb46fbf4d4ed60182cf5/src/ggml.c#L14077

   In a basic case (ext_factor is 0), the theta uses for cos/sin is scaled by freq_scale * freq_scale. I think this is wrong and this line should be deleted.

2. value passed to int64_t i0 is wrong: (data type does not matches, either.)

   https://github.com/ggerganov/ggml/blob/0cbb7c0e053f5419cfbebb46fbf4d4ed60182cf5/src/ggml.c#L14082-L14088

   I think it should be ic here.

   (Confirmed when implementing DeepSeek V2 models)

[foldl]

This has been resolved.