crypto: ccp - Fix sparse warnings in sev-dev

This patch fixes a bunch of sparse warnings in sev-dev where the
__user marking is incorrectly handled.

Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 7360e4b1 ("crypto: ccp: Implement SEV_PEK_CERT_IMPORT...")
Fixes: e7990356 ("crypto: ccp: Implement SEV_PEK_CSR ioctl...")
Fixes: 76a2b524 ("crypto: ccp: Implement SEV_PDH_CERT_EXPORT...")
Fixes: d6112ea0 ("crypto: ccp - introduce SEV_GET_ID2 command")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>