ARM: dts: socfpga: add base fpga region and fpga bridges

Add h2f and lwh2f bridges.
Add base FPGA Region to support DT overlays for FPGA programming.
Add l3regs.

Signed-off-by: Alan Tull <atull@opensource.altera.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
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v2: removed fpga-bridges, ranges, and reset-names