Same patch as before, modified to use bool. Also adds description of
the new field in struct atmel_mci that I missed in the first patch.

This patch adds Atmel MCI support for inverted detect pins.
Signed-off-by: NJonas Larsson <jonas.larsson@martinsson.se>
Acked-by: NPierre Ossman <pierre@ossman.eu>
Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com>