fpga: x400: zbx: Add support for XO3 CPLD variant.

The main changes included are:
- Variant-dependent pin-out instantiation.
- Update clocking scheme in top level file
  to include XO3 PLL
- Add ability to shift outgoing data for
  the GPIO communication interface with
  the X410 FPGA.
- Include project files required to build
  the XO3 variant of the ZBX CPLD.
- Add build flow for Lattice Diamond designs.
- Add ability to build XO3 variant of ZBX CPLD.


Original-commit: 2c7813acb21383f302353a1b6cf57f0946fa0b6b

top/x400/dboards/zbx/cpld/.gitignore

@@ -5,3 +5,11 @@ doc/*.xml
 incremental_db/
 output_files/
 *.sopcinfo
+# Ignore Diamond generated files.
+lattice/impl1/
+lattice/zbx_*.dir/
+lattice/*_log.txt
+lattice/*.xml
+lattice/*.html
+lattice/*.ini
+lattice/*.recovery