mpm/fpga: x4xx: Major updates in preparation for future devices

FPGA:
- Split up MB registers that control daughterboard specific settings so
  that daughterboards 0 and 1 could have different setings, in
  preparation for future devices that require different settings.
  This requires a compat number bump to 8.0.
- Add registers for additional RFDC information, including the
  block/tile mapping of the individual channels, and information about
  resampling capabilities
- Identify sections of code that would be specific to X410/ZBX and move
  them to their own headers, so it's trivial to add device-specific
  sections of code instead for other devices in the future.
  - This includes constraints for clocks and I/O pins.
- Remove ability to do timed ctrlport transactions to the MB CPLD, this
  was unused and possibly broken.
- Move daughterboard-specific code into its own code location
  (dboards/zbx)
- Move X410-specific register documentation to its own location
  (doc/X410)
- Refactor Makefiles to split out X410/ZBX specific components and allow
  switching between device types
- Add 512-bit AXI interconnects
- Make number of timekeepers configurable (X410 keeps the single
  timekeeper)

MPM:
- Required compat is bumped to 8.0
- Now supports new registers for detecting DSP capabilities and
  multi-rate settings for the daughterboards
- Adds MMCM controls (currently unused)

Co-authored-by: Wade Fife <wade.fife@ni.com>
Co-authored-by: Ryan Marlow <ryan@lmarlow.com>
Co-authored-by: Martin Braun <martin.braun@ettus.com>
Co-authored-by: Humberto Jimenez <humberto.jimenez@ni.com>


Original-commit: c1d268917ea65dd9c5a42366014cb96d3c025223

top/x400/cpld_interface_regs.v

@@ -45,9 +45,11 @@ module cpld_interface_regs #(
   output wire [95:0] version_info
 );
 
-  `include "regmap/cpld_interface_regmap_utils.vh"
-  `include "regmap/versioning_regs_regmap_utils.vh"
+  // Variant-dependent register map.
+  `include "regmap/x410/versioning_regs_regmap_utils.vh"
+
   `include "regmap/versioning_utils.vh"
+  `include "regmap/cpld_interface_regmap_utils.vh"
   `include "../../lib/rfnoc/core/ctrlport.vh"
 
   //----------------------------------------------------------