staging: unisys: include: replaced COVERQ with DIV_ROUND_UP

COVERQ is functionally equivalent to DIV_ROUND_UP and was only used
to define the COVER macro.

Signed-off-by: Alexander Curtin <alexander.curtin@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>