This patch fixes the Kernel panic issue on accessing davinci_vc in
cq93vc_probe function. struct davinci_vc is part of platform device's
private driver data(codec->dev->p->driver_data) and this is populated
by DaVinci Voice Codec MFD driver.
Signed-off-by: NManjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>