In patch 81f8a7be66 Hans de Goede added a patch to allow marking an mmc
device as to having an broken HPI implementation. After talking some[...]
with Hans, we now think it is actually the mmc controller that can be
broken and not support broken HPI's.
This patch adds a new capability, mmc-broken-hpi, which allows us to
mark a broken hpi implementation on the host level.
Signed-off-by: Olliver Schinagl <oliver@xxxxxxxxxxx>