Provide simple helper functions to map virtual address range into an
array of pfns / pages.
Tested-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>