pcmcia: remove unused dprintk definition

A recent cleanup patch removed the remaining users of dprintk() in
i82092.c, so get rid of the definition of dprintk() as well.

Fixes: 836e9494 ("pcmcia/i82092: Refactored dprintk macro for dev_dbg().")
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>