Feature Request: Gemma3n multimodal support

[bil-ash]

Prerequisites

• I am running the latest code. Mention the version if possible as well.
• I carefully followed the README.md.
• I searched using keywords relevant to my issue to make sure that I am creating a new issue that is not already open (or closed).
• I reviewed the Discussions, and have a new and useful enhancement to share.

Feature Description

Currently only gemma3n text modality is supported and so multimodal inference(ASR/vision) cannot be carried out.

Motivation

Currently only gemma3n text modality is supported in llama.cpp. Please add support for gemma3n multimodality.

Possible Implementation

No response