ocb3: switch `L_TABLE_SIZE` to generic parameter (#763) #1234

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	23s
build (stable, wasm32-unknown-unknown)	23s
test (x86_64-unknown-linux-gnu, 1.85.0)	25s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	40s
build (1.85.0, wasm32-unknown-unknown)	18s
test (i686-unknown-linux-gnu, 1.85.0, sudo apt update && sudo apt install gcc-multilib)	49s
build (stable, armv7a-none-eabi)	14s
build (stable, thumbv7em-none-eabi)	35s
build (1.85.0, armv7a-none-eabi)	15s
build (1.85.0, thumbv7em-none-eabi)	17s
	4m 19s

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