[ET-VK] Reduced int precision for texture coordinates in conv2d_pw op, to reduce shader register pressure and slightly improve performance.

[trivedivivek]

Stack from ghstack (oldest at bottom):

• [ET-VK] Reduced int precision for texture coordinates in conv2d_pw op, to reduce shader register pressure. #6468
• [ET-VK] Removing tile input storage variable in conv_pw op and fetching the data in main loop. Also unrolling the main loop for performance improvement. #6467
• -> [ET-VK] Reduced int precision for texture coordinates in conv2d_pw op, to reduce shader register pressure and slightly improve performance. #6466
• [ET-VK] Reduced int precision for all int storage in q linear op, and reducing some texture coordinate storage variables to improve performance. #6465

This diff reduces the precision of texture coordinates in the conv2d_pw op in Executorch Vulkan backend to reduce shader register pressure.

Differential Revision: D64766910

[pytorch-bot]

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This pull request was exported from Phabricator. Differential Revision: D64766910