kmp204x: initial support for PCIe FPGA configuration
The PEXHC PCIe configuration mechanism ensures that the FPGA get configured at power-up. Since all the PCIe devices should be configured when the kernel start, u-boot has to take care that the FPGA gets configured also in other reset scenarios, mostly because of possible configuration change. The used mechanism is taken from the km_kirkwood design and adapted to the kmp204x case (slightly different HW and PCIe configuration). Signed-off-by: NValentin Longchamp <valentin.longchamp@keymile.com> Reviewed-by: NYork Sun <yorksun@freescale.com>
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