Use a matching device tree node to initialize the flow controller driver
instead of hard-coding the I/O address. This is necessary to get rid of
the iomap.h include, which in turn make it easier to share this code
with 64-bit Tegra SoCs.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NStephen Warren <swarren@nvidia.com>