Add quantized_batch_matmul to OPERATORS list

[Ninja91]

Summary:
op_quantized_batch_matmul.cpp has a complete CMSIS-NN implementation of cortex_m::native::quantized_batch_matmul_out (using arm_batch_matmul_s8), but "quantized_batch_matmul" was missing from the OPERATORS list in targets.bzl.

Without it, define_operator_target("quantized_batch_matmul") was never called, so no :op_quantized_batch_matmul Buck target was created. cortex_m_operators exports all_op_targets using [":op_{}".format(op) for op in OPERATORS], so the operator was never included as a dependency.

executorch_generated_lib reads operators.yaml (which correctly declares cortex_m::quantized_batch_matmul.out) and generates RegisterCodegenUnboxedKernelsEverything.cpp, which calls cortex_m::native::quantized_batch_matmul_out. Since the compiled implementation was not linked in, ARM builds failed:
undefined reference to cortex_m::native::quantized_batch_matmul_out

Fix: add "quantized_batch_matmul" to OPERATORS in both targets.bzl mirrors (xplat and fbcode). This creates the missing :op_quantized_batch_matmul Buck target, includes it in cortex_m_operators, and allows cortex_m_generated_lib and cortex_m_no_except_generated_lib to link successfully.

Differential Revision: D96686225

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@Ninja91 has exported this pull request. If you are a Meta employee, you can view the originating Diff in D96686225.

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[Copilot]

Pull request overview

Adds the missing Cortex-M build target for the quantized_batch_matmul operator so the CMSIS-NN implementation is compiled and linked, preventing undefined-reference link failures in ARM embedded builds.

Changes:

• Add quantized_batch_matmul to the Cortex-M OPERATORS list so :op_quantized_batch_matmul is generated and included in :cortex_m_operators.

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