firmware: drop bit ops in favor of simple state machine

We track the state of the firmware loading with bit ops.  Since the
state machine has only a few states and they are all mutual exclusive
there are only a few simple state transition we can model this simplify.

	   UNKNOWN -> LOADING -> DONE | ABORTED

Because we don't use any bit ops on fw_state::status anymore we are able
to change the data type to enum fw_status and update the function
arguments accordingly.

READ_ONCE() and WRITE_ONCE() are propably not needed because there are a
lot of load and stores around fw_st->status. But let's make it explicit
and not be sorry later.

Cc: Ming Lei <[email protected]>
Signed-off-by: Daniel Wagner <[email protected]>
Acked-by: Luis R. Rodriguez <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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