HSD #22012990567: crypto: intel_fcs: use the word rather than bit

commit  21cc6bedd378f313a2df8f06c1deab4de3644604 from
https://github.com/altera-opensource/linux-socfpga.git

Using the word rather than bit for certificate to address a comment from
community on upstreamed patch.

Signed-off-by: Richard Gong <richard.gong@intel.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>