srp

Revert "srp: add HomeKit-compatible padding options for u and M1/M2" … #483

Job	Run time
test (stable)	39s
build (stable, thumbv7em-none-eabi)	20s
build (1.85, thumbv7em-none-eabi)	23s
build (stable, wasm32-unknown-unknown)	20s
build (1.85, wasm32-unknown-unknown)	21s
test (1.85)	44s
	2m 47s

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