net: ieee802154: Fix compilation error when CONFIG_IEEE802154_NL802154_EXPERIMENTAL is disabled

When CONFIG_IEEE802154_NL802154_EXPERIMENTAL is disabled,
NL802154_CMD_DEL_SEC_LEVEL is undefined and results in a compilation
error:
net/ieee802154/nl802154.c:2503:19: error: 'NL802154_CMD_DEL_SEC_LEVEL' undeclared here (not in a function); did you mean 'NL802154_CMD_SET_CCA_ED_LEVEL'?
 2503 |  .resv_start_op = NL802154_CMD_DEL_SEC_LEVEL + 1,
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                   NL802154_CMD_SET_CCA_ED_LEVEL

Unhide the experimental commands, having them defined in an enum
makes no difference.

Fixes: 9c5d03d362 ("genetlink: start to validate reserved header bytes")
Signed-off-by: Gal Pressman <gal@nvidia.com>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Link: https://lore.kernel.org/r/20220902030620.2737091-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/nl802154.h

@@ -58,9 +58,6 @@ enum nl802154_commands {
 
 	NL802154_CMD_SET_WPAN_PHY_NETNS,
 
-	/* add new commands above here */
-
-#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
 	NL802154_CMD_SET_SEC_PARAMS,
 	NL802154_CMD_GET_SEC_KEY,		/* can dump */
 	NL802154_CMD_NEW_SEC_KEY,
@@ -74,7 +71,8 @@ enum nl802154_commands {
 	NL802154_CMD_GET_SEC_LEVEL,		/* can dump */
 	NL802154_CMD_NEW_SEC_LEVEL,
 	NL802154_CMD_DEL_SEC_LEVEL,
-#endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */
+
+	/* add new commands above here */
 
 	/* used to define NL802154_CMD_MAX below */
 	__NL802154_CMD_AFTER_LAST,