Staging: kpc2000: Remove warning: "dubious: x | !y" detected by sparse

Sparse complains about "dubious: x | !y".

This patch adds some macros to make it clear if a flag will be enabled or
not so Sparse stops complaining about dubious code construct.

Signed-off-by: Felipe Cardoso Resende <felipecardoso.fcr@gmail.com>
Link: https://lore.kernel.org/r/20200117004214.GA1800@felipe-pc


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>