power: supply: Provide stubs for charge_behaviour helpers

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071846
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
 support in the kernel for NXP i.MX8 platforms.  This set updates the
 power subsystem.  This set has been tested via simple boot tests and
 the CI loop.

commit 3367d1b
Author: Thomas Weißschuh <linux@weissschuh.net>
Date:   Sat Jan 8 16:31:58 2022 +0100

    power: supply: Provide stubs for charge_behaviour helpers

    When CONFIG_SYSFS is not enabled provide stubs for the helper functions
    to not break their callers.

    Fixes: 539b9c9 ("power: supply: add helpers for charge_behaviour sysfs")
    Reported-by: kernel test robot <lkp@intel.com>
    Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
    Link: https://lore.kernel.org/r/20220108153158.189489-1-linux@weissschuh.net
    Signed-off-by: Hans de Goede <hdegoede@redhat.com>
    (cherry picked from commit 3367d1b)

Signed-off-by: Al Stone <ahs3@redhat.com>

Author: Al Stone

include/linux/power_supply.h

@@ -725,6 +725,21 @@ ssize_t power_supply_charge_behaviour_show(struct device *dev,
 					   char *buf);
 
 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf);
+#else
+static inline
+ssize_t power_supply_charge_behaviour_show(struct device *dev,
+					   unsigned int available_behaviours,
+					   enum power_supply_charge_behaviour behaviour,
+					   char *buf)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int power_supply_charge_behaviour_parse(unsigned int available_behaviours,
+						      const char *buf)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 
 #endif /* __LINUX_POWER_SUPPLY_H__ */