ASoC: mediatek: Enable 33bit memory address to support 4GB DRAM

If platform is embedded with memory more than 3GB, the address will
go out of the scope that 32-bit can handle with. This patch sets the
dma_mask and MSB properly to describe its address to 33-bit.

Signed-off-by: Hidalgo Huang <hidalgo.huang@mediatek.com>
Signed-off-by: PC Liao <pc.liao@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>