RISC-V: defconfig: Add CRYPTO_DEV_VIRTIO=y

This allows acceleration of cryptography inside QEMU.
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

arch/riscv/configs/defconfig

@@ -78,5 +78,6 @@ CONFIG_NFS_V4_1=y
 CONFIG_NFS_V4_2=y
 CONFIG_ROOT_NFS=y
 CONFIG_CRYPTO_USER_API_HASH=y
+CONFIG_CRYPTO_DEV_VIRTIO=y
 CONFIG_PRINTK_TIME=y
 # CONFIG_RCU_TRACE is not set