nds32: Fix the items of hwcap_str ordering issue.

The hwcap_str should be set in a correct order according to HWCAP_xx.
We also add the missing "fpu_dp" to it.

Signed-off-by: Nylon Chen <nylon7@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>