MAINTAINERS: power: supply: cover also header files

Only one header (smartreflex.h) in include/linux/power/ is not related
to battery or charger drivers.  All others should be covered by power
supply maintainers entry so patches to them will reach respective people
and lists.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

MAINTAINERS

@@ -14659,6 +14659,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git
 F:	Documentation/ABI/testing/sysfs-class-power
 F:	Documentation/devicetree/bindings/power/supply/
 F:	drivers/power/supply/
+F:	include/linux/power/
 F:	include/linux/power_supply.h
 
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