lib/crc32: remove other generic implementations

Now that we've standardized on the byte-by-byte implementation of CRC32
as the only generic implementation (see previous commit for the
rationale), remove the code for the other implementations.

Tested with crc_kunit.

Link: https://lore.kernel.org/r/20250123212904.118683-3-ebiggers@kernel.org
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>

lib/Kconfig

@@ -189,7 +189,6 @@ config CRC32
 	tristate "CRC32/CRC32c functions"
 	default y
 	select BITREVERSE
-	select CRC32_SARWATE
 	help
 	  This option is provided for the case where no in-kernel-tree
 	  modules require CRC32/CRC32c functions, but a module built outside
@@ -203,9 +202,6 @@ config CRC32_ARCH
 	tristate
 	default CRC32 if ARCH_HAS_CRC32 && CRC_OPTIMIZATIONS
 
-config CRC32_SARWATE
-	bool
-
 config CRC64
 	tristate "CRC64 functions"
 	help