const_structs.checkpatch: add regmap structs

Many structs used by regmap should be const by default.
Add entries to const_structs.checkpatch for them for checkpatch.pl to
warn on new non-const additions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20240706-regmap-const-structs-v1-1-d08c776da787@weissschuh.netSigned-off-by: Mark Brown <broonie@kernel.org>

scripts/const_structs.checkpatch

@@ -64,7 +64,16 @@ platform_suspend_ops
 proc_ops
 proto_ops
 pwm_ops
+reg_default
+reg_field
+reg_sequence
 regmap_access_table
+regmap_bus
+regmap_config
+regmap_irq
+regmap_irq_chip
+regmap_range
+regmap_range_cfg
 regulator_ops
 reset_control_ops
 rpc_pipe_ops