crypto: arm64/sha1-ce - get rid of literal pool

Load the four SHA-1 round constants using immediates rather than literal
pool entries, to avoid having executable data that may be exploitable
under speculation attacks.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>