PCMCIA/i82092: remove #if 0 block

Remove the unused function indirect_read16, which
is similar to indirect_read with the exception that
it reads 16 instead of 8 bit.

Co-developed-by: Lukas Panzer <lukas.panzer@fau.de>
Signed-off-by: Lukas Panzer <lukas.panzer@fau.de>
Signed-off-by: Simon Geis <simon.geis@fau.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>