uio: add missing MODULE_DESCRIPTION() macros

Fix the 'make W=1' warnings:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/uio/uio.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/uio/uio_cif.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/uio/uio_aec.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/uio/uio_netx.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/uio/uio_mf624.o

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240523-md-drivers-uio-v2-1-5173b2ae9563@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>