staging: unisys: include: iochannel.h: Removed unused DEFINE

Removed unused #define GPI_ENTRIES_PER_PAGE

Signed-off-by: Zohaib Javed <zohaib.javed@gmail.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: David Binder <david.binder@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>