xen/arm: Map disabled device in DOM0

xen/arm: Map disabled device in DOM0

The check to avoid mapping disabled devices in DOM0 was added in
anticipation of the device passthrough. But, a brand new property will
be added later to mark device which will be passthrough.

Also, remove the memory type check as we already skipped them earlier in
the function via skip_matches.

Furthermore, some platform (such as the OMAP) may try to poke device even
if the property "status" is set to "disabled".

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Andrii Tseglytskyi <andrii.tseglytskyi@globallogic.com>