minor rtl edits

[stnolting]

• constrain configuration generics (via range)
• minor VHDL code cleanups
• update AXI wrapper; add missing configuration options and signals

[NikLeberg]

Since you are already updating the dm: I have noticed during my multi-hart extension that the member progbuf in the dci_t record is not used anywhere. Seems to be a leftover of a refactoring.

index 6622cc16..e738a624 100644
--- a/rtl/core/neorv32_debug_dm.vhd
+++ b/rtl/core/neorv32_debug_dm.vhd
@@ -215,7 +215,6 @@ architecture neorv32_debug_dm_rtl of neorv32_debug_dm is
     execute_req   : std_ulogic; -- DM wants CPU to execute program buffer when set
     execute_ack   : std_ulogic; -- CPU starts executing program buffer when set (single-shot)
     exception_ack : std_ulogic; -- CPU has detected an exception (single-shot)
-    progbuf       : std_ulogic_vector(255 downto 0); -- program buffer, 4 32-bit entries
     data_we       : std_ulogic; -- write abstract data
     data_reg      : std_ulogic_vector(31 downto 0); -- memory-mapped data exchange register
   end record;

[stnolting]

You are right! Thanks for noticing!