Remove f16_f32_vcvt_params struct #1423

Job	Run time
build-and-test / cmake-linux-armhf	13m 28s
build-and-test / cmake-linux-local	12m 57s
build-and-test / cmake-linux-aarch64	11m 28s
build-and-test / cmake-linux-riscv64	7m 35s
build-and-test / cmake-linux-riscv64-rvv	11m 22s
build-and-test / bazel-linux-x86_64	13m 47s
build-and-test / bazel-linux-x86_64-gcc-9	8m 8s
build-and-test / bazel-linux-aarch64	9m 37s
build-and-test / cmake-android (arm64)	10m 14s
build-and-test / cmake-ios-arm64	4m 58s
build-and-test / cmake-android (armv7)	9m 26s
build-and-test / cmake-ios-x86_64	8m 9s
build-and-test / cmake-android (x86)	11m 15s
build-and-test / cmake-macos-arm64	12m 59s
build-and-test / cmake-windows-arm64	7m 1s
build-and-test / cmake-windows-x64	8m 50s
build-and-test / cmake-windows-x86	8m 53s
	2h 50m 7s

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