To help the driver to get the correct memory range to access McPDM
registers.
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: NJanusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>