staging: rtl8723au: rtl8723a_update_ramask(): Get rid of annoying debug message

There really is no need to print this message for anyone not trying to
debug the driver:

  rtl8723a_update_ramask => mac_id:0, networkType:0x0b, mask:0x000fffff

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>