hkd32: remove usage of `zeroize_derive` #773

Job	Run time
build (1.65.0, armv7a-none-eabi)	2m 1s
build (1.65.0, thumbv7em-none-eabi)	2m 4s
build (1.65.0, wasm32-unknown-unknown)	2m 3s
build (stable, armv7a-none-eabi)	24s
test (ubuntu-latest, 1.65.0)	2m 10s
build (stable, thumbv7em-none-eabi)	19s
test (ubuntu-latest, stable)	34s
build (stable, wasm32-unknown-unknown)	20s
test (macos-latest, 1.65.0)	2m 10s
test (macos-latest, stable)	25s
test (windows-latest, 1.65.0)	2m 51s
test (windows-latest, stable)	1m 5s
	16m 26s

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