commands/file: Fix array/enum desync

commands/file: Fix array/enum desync

The commit f1957dc8a (RISC-V: Add to build system) added two entries to
the options array, but only 1 entry to the enum. This resulted in
everything after the insertion point being off by one.

This broke at least the "file --is-hibernated-hiberfil" command.

Bring the two back in sync by splitting the IS_RISCV_EFI enum entry into
two, as is done for other architectures.

Signed-off-by: Derek Foreman <derek@endlessos.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>