Fix kconfig unmet dependency warning:

warning: (VIDEO_TIMBERDALE) selects TIMB_DMA which has unmet direct dependencies (DMADEVICES && (MFD_TIMBERDALE || HAS_IOMEM))
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Cc: Pelagicore AB <info@pelagicore.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>