Remove f16_f32_vcvt_params struct #1424

Job	Run time
build-and-test / cmake-linux-aarch64	10m 15s
build-and-test / cmake-linux-armhf	12m 42s
build-and-test / cmake-linux-local	12m 47s
build-and-test / cmake-linux-riscv64-rvv	10m 20s
build-and-test / cmake-linux-riscv64	8m 12s
build-and-test / bazel-linux-aarch64	10m 35s
build-and-test / bazel-linux-x86_64	13m 58s
build-and-test / bazel-linux-x86_64-gcc-9	8m 6s
build-and-test / cmake-android (arm64)	10m 44s
build-and-test / cmake-android (armv7)	9m 46s
build-and-test / cmake-ios-arm64	5m 31s
build-and-test / cmake-android (x86)	12m 25s
build-and-test / cmake-macos-arm64	12m 14s
build-and-test / cmake-ios-x86_64	8m 6s
build-and-test / cmake-windows-arm64	6m 53s
build-and-test / cmake-windows-x64	10m 33s
build-and-test / cmake-windows-x86	11m 18s
	2h 54m 25s

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