crypto: x86/sha1 - Rename conflicting symbol

crypto: x86/sha1 - Rename conflicting symbol

Rename x86's sha1_update() to sha1_update_x86(), since it conflicts with
the upcoming sha1_update() library function.

Note: the affected code will be superseded by later commits that migrate
the arch-optimized SHA-1 code into the library.  This commit simply
keeps the kernel building for the initial introduction of the library.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250712232329.818226-2-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>