arm64: lib: accelerate crc32_be

It makes no sense to leave crc32_be using the generic code while we
only accelerate the little-endian ops.

Even though the big-endian form doesn't fit as smoothly into the arm64,
we can speed it up and avoid hitting the D cache.

Tested on Cortex-A53. Without acceleration:

    crc32: CRC_LE_BITS = 64, CRC_BE BITS = 64
    crc32: self tests passed, processed 225944 bytes in 192240 nsec
    crc32c: CRC_LE_BITS = 64
    crc32c: self tests passed, processed 112972 bytes in 21360 nsec

With acceleration:

    crc32: CRC_LE_BITS = 64, CRC_BE BITS = 64
    crc32: self tests passed, processed 225944 bytes in 53480 nsec
    crc32c: CRC_LE_BITS = 64
    crc32c: self tests passed, processed 112972 bytes in 21480 nsec

Signed-off-by: Kevin Bracey <[email protected]>
Tested-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Ard Biesheuvel <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

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