eth: pse: add missing static inlines

build bot reports missing 'static inline' qualifiers in the header.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 18ff0bcd ("ethtool: add interface to interact with Ethernet Power Equipment")
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20221004040327.2034878-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/linux/pse-pd/pse.h

@@ -110,16 +110,16 @@ static inline void pse_control_put(struct pse_control *psec)
 {
 }
 
-int pse_ethtool_get_status(struct pse_control *psec,
-			   struct netlink_ext_ack *extack,
-			   struct pse_control_status *status)
+static inline int pse_ethtool_get_status(struct pse_control *psec,
+					 struct netlink_ext_ack *extack,
+					 struct pse_control_status *status)
 {
 	return -ENOTSUPP;
 }
 
-int pse_ethtool_set_config(struct pse_control *psec,
-			   struct netlink_ext_ack *extack,
-			   const struct pse_control_config *config)
+static inline int pse_ethtool_set_config(struct pse_control *psec,
+					 struct netlink_ext_ack *extack,
+					 const struct pse_control_config *config)
 {
 	return -ENOTSUPP;
 }