Use Linear tiling by default for executorch vulkan tensor images #6838
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Summary:
This diff changes the default image layout for a tensor from TILING_OPTIMAL to TILING_LINEAR.
Linear tiling helps improve memory utilization by minimizing texture padding and give better control over texture caching.
q_8w_linear op shader and dispatch settings are modified to utilize linearity of texture.
Differential Revision: D65912644