Eliminate MixedInput kernel schedule tags.

[azhurkevich]

To our beloved userbase. We will delete kernel schedule tags KernelTmaWarpSpecializedMixedInput, KernelTmaWarpSpecializedPingpongMixedInput and KernelTmaWarpSpecializedCooperativeMixedInput. There is no need to have them since they are tags that bring no specialization and under the hood use KernelTmaWarpSpecialized, KernelTmaWarpSpecializedPingpong and KernelTmaWarpSpecializedCooperative respectively. This applies to everyone who uses example 55 or its derivatives, i.e. mixed dtype GEMM for Hopper. If you application uses these MixedInput schedules, simple delete MixedInput. Thank you!