orinoco: Use a macro to define wireless handlers

The macro identifiers for the various ioctls required for WPA support
are longer than those currently used by the driver. This makes it messy
to keep line length below 80 character.

By defining a macro to initialise the handler table, we recover the
common text.

Signed-off-by: David Kilroy <kilroyd@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>