sirf uart and usp-based uart driver with full dma support has
hit 3.12, here we fix the fifosize, dma channels for some HW
prop.
Signed-off-by: NQipan Li <Qipan.Li@csr.com>
Signed-off-by: NBarry Song <Baohua.Song@csr.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>