crypto: sha-mb - Add avx2_supported check.

This patch fixes this allyesconfig target build error with older
binutils.

  LD      arch/x86/crypto/built-in.o
ld: arch/x86/crypto/sha-mb/built-in.o: No such file: No such file or directory

Cc: [email protected] # 3.18+
Signed-off-by: Vinson Lee <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
1 file changed