dyndbg: test DECLARE_DYNDBG_CLASSMAP, sysfs nodes

Demonstrate use of DECLARE_DYNDBG_CLASSMAP macro, and expose them as
sysfs-nodes for testing.

For each of the 4 class-map-types:

  - declare a class-map of that type,
  - declare the enum corresponding to those class-names
  - share _base across 0..30 range
  - add a __pr_debug_cls() call for each class-name
  - declare 2 sysnodes for each class-map
    for 'p' flag, and future 'T' flag

These declarations create the following sysfs parameter interface:

  :#> pwd
  /sys/module/test_dynamic_debug/parameters
  :#> ls
  T_disjoint_bits  T_disjoint_names  T_level_names  T_level_num  do_prints
  p_disjoint_bits  p_disjoint_names  p_level_names  p_level_num

NOTES:

The local wrapper macro is an api candidate, but there are already too
many parameters.  OTOH, maybe related enum should be in there too,
since it has _base inter-dependencies.

The T_* params control the (future) T flag on the same class'd
pr_debug callsites as their p* counterparts.  Using them will fail,
until the dyndbg-trace patches are added in.

:#> echo 1 > T_disjoint
[   28.792489] dyndbg: disjoint: 0x1 > test_dynamic_debug.T_D2
[   28.793848] dyndbg: query 0: "class D2_CORE +T" mod:*
[   28.795086] dyndbg: split into words: "class" "D2_CORE" "+T"
[   28.796467] dyndbg: op='+'
[   28.797148] dyndbg: unknown flag 'T'
[   28.798021] dyndbg: flags parse failed
[   28.798947] dyndbg: processed 1 queries, with 0 matches, 1 errs
[   28.800378] dyndbg: bit_0: -22 matches on class: D2_CORE -> 0x1
[   28.801959] dyndbg: test_dynamic_debug.T_D2: updated 0x0 -> 0x1
[   28.803974] dyndbg: total matches: -22

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220904214134.408619-22-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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