power: supply: core: Move psy_has_property() to fix build

If CONFIG_THERMAL=n:

    drivers/power/supply/power_supply_core.c: In function ‘__power_supply_register’:
    drivers/power/supply/power_supply_core.c:1137:6: error: implicit declaration of function ‘psy_has_property’ [-Werror=implicit-function-declaration]
     1137 |  if (psy_has_property(desc, POWER_SUPPLY_PROP_USB_TYPE) &&
	  |      ^~~~~~~~~~~~~~~~

Fix this by moving psy_has_property() outside the section protected by
CONFIG_THERMAL.

Fixes: 9ba533eb ("power: supply: core: Add psy_has_property()")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>