lib/crc: x86: Reorganize crc-pclmul static_call initialization

Reorganize the crc-pclmul static_call initialization to place more of
the logic in the *_mod_init_arch() functions instead of in the
INIT_CRC_PCLMUL macro.  This provides the flexibility to do more than a
single static_call update for each CPU feature check.  Right away,
optimize crc64_mod_init_arch() to check the CPU features just once
instead of twice, doing both the crc64_msb and crc64_lsb static_call
updates together.  A later commit will also use this to initialize an
additional static_key when crc32_lsb_vpclmul_avx512() is enabled.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250719224938.126512-2-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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