Revert D64334733: Use Eigen blas for custom sdpa #4539

Job	Run time
build-benchmark-app / macos-job	24m 8s
build-demo-ios / macos-job	13m 25s
build-frameworks-ios / macos-job	28m 51s
upload-demo-ios	19s
test-demo-ios / mobile-job (ios)	14m 18s
upload-frameworks-ios	29s
	1h 21m 30s

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