Remove f16_f32_vcvt_params struct #74

Job	Run time
build-and-test / bazel-linux-aarch64	10m 17s
build-and-test / bazel-linux-x86_64	10m 11s
build-and-test / bazel-linux-x86_64-gcc-9	5m 42s
build-and-test / cmake-android (arm64)	10m 57s
build-and-test / cmake-android (armv7)	10m 19s
build-and-test / cmake-android (x86)	11m 54s
build-and-test / cmake-ios-arm64	6m 40s
build-and-test / cmake-ios-x86_64	10m 37s
build-and-test / cmake-linux-aarch64	10m 47s
build-and-test / cmake-linux-armhf	12m 26s
build-and-test / cmake-linux-local	13m 0s
build-and-test / cmake-linux-riscv64	6m 46s
build-and-test / cmake-linux-riscv64-rvv	6m 55s
build-and-test / cmake-macos-arm64	11m 42s
build-and-test / cmake-windows-arm64	8m 52s
build-and-test / cmake-windows-x64	10m 23s
build-and-test / cmake-windows-x86	11m 15s
	2h 48m 43s

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