staging: kpc2000: Fix build error without CONFIG_UIO

Fix gcc build error while CONFIG_UIO is not set

ERROR: "uio_unregister_device" [drivers/staging/kpc2000/kpc2000/kpc2000.ko] undefined!
ERROR: "__uio_register_device" [drivers/staging/kpc2000/kpc2000/kpc2000.ko] undefined!

Add UIO Kconfig dependency to fix this.

Reported-by: Hulk Robot <hulkci@huawei.com>
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 7dc7967f ("staging: kpc2000: add initial set of Daktronics drivers")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>