x86/crc32: implement crc32_le using new template

x86/crc32: implement crc32_le using new template

Instantiate crc-pclmul-template.S for crc32_le, and delete the original
PCLMULQDQ optimized implementation.  This has the following advantages:

- Less CRC-variant-specific code.
- VPCLMULQDQ support, greatly improving performance on sufficiently long
  messages on newer CPUs.
- A faster reduction from 128 bits to the final CRC.
- Support for lengths not a multiple of 16 bytes, improving performance
  for such lengths.
- Support for misaligned buffers, improving performance in such cases.

Benchmark results on AMD Ryzen 9 9950X (Zen 5) using crc_kunit:

	Length     Before        After
	------     ------        -----
	     1     427 MB/s      605 MB/s
	    16     710 MB/s     3631 MB/s
	    64     704 MB/s     7615 MB/s
	   127    3610 MB/s     9710 MB/s
	   128    8759 MB/s    12702 MB/s
	   200    7083 MB/s    15343 MB/s
	   256   17284 MB/s    22904 MB/s
	   511   10919 MB/s    27309 MB/s
	   512   19849 MB/s    48900 MB/s
	  1024   21216 MB/s    62630 MB/s
	  3173   22150 MB/s    72437 MB/s
	  4096   22496 MB/s    79593 MB/s
	 16384   22018 MB/s    85106 MB/s

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20250210174540.161705-5-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>