xen/arm: vexpress: Blacklist a list of board specific devices

xen/arm: vexpress: Blacklist a list of board specific devices

On Versatile there are a bunch of devices which must not be pass-through to any
guest (power management and cache coherency devices).

This commit also blacklists the HDLCD device because Xen is unable to correctly
map the framebuffer into dom0. Therefore, when Linux will try to access to the
framebuffer, Xen will receive a non-handled data access.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>