crypto: user - Move cryptouser.h to uapi

The header file cryptouser.h only contains information that is
exported to user-space.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/include/linux/cryptouser.h b/include/uapi/linux/cryptouser.h
similarity index 100%
rename from include/linux/cryptouser.h
rename to include/uapi/linux/cryptouser.h