fix binary size test

[lucylq]

Summary

fix gcc binary test

broken after: #18142

Test plan

ci

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18177

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[Copilot]

Pull request overview

Fixes GCC build failures introduced after #18142 by making bounds checks compare like-signed integer types in portable CPU kernels (avoids -Wsign-compare under -Werror, which impacts the binary size test build).

Changes:

• Cast in_W/in_H/out_W/out_H (stored as size_t) to ssize_t in bounds checks against computed ssize_t indices.
• Applies the same fix pattern in both the generic kernel util path and the convolution implementation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
kernels/portable/cpu/util/kernel_ops_util.h	Fixes signed/unsigned comparison in 2D kernel bounds checks (in_x/in_y vs in_W/in_H).
kernels/portable/cpu/op_convolution.cpp	Fixes signed/unsigned comparison in conv2d (and transposed conv) bounds checks for input/output coordinates.

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