sha2: remove RISC-V hack for unaligned loads (#879) #1247

Job	Run time
set-msrv / set-msrv	4s
minimal-versions / minimal-versions	33s
build (stable, thumbv7em-none-eabi)	24s
test (1.85.0)	35s
build (1.85.0, wasm32-unknown-unknown)	23s
build (1.85.0, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	23s
test (stable)	36s
	3m 20s

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