arm64 kernels: add accelerated crc32 routines #806
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Incorporate changes from Linux 4.20/4.21 to accelerate the kernel's crc32_le and __crc32c_le helpers.
Incorporates:
9784d82db ("make core crc32() routines weak so they can be overridden")
7481cddf2 ("arm64/lib: add accelerated crc32 routines")
efdb25efc ("arm64/lib: improve CRC32 performance for deep pipelines")
ff98e20ef ("lib/crc32.c: mark c4c32_le_base/__crc32_le_base alias as __pure")
But omits the runtime selection which uses machinery that differs significantly in Linux 4.1. We assume CRC support is always available.