MAINTAINERS: Add linux-acpi list to PNP

As asked by the PNP maintainer, linux PNP patch should be CC to
the linux-acpi mailing list.

Signed-off-by: Corentin Labbe <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: montjoie

MAINTAINERS

@@ -13348,6 +13348,7 @@ F:	Documentation/devicetree/bindings/iio/magnetometer/pni,rm3100.txt
 
 PNP SUPPORT
 M:	"Rafael J. Wysocki" <[email protected]>
+L:	[email protected]
 S:	Maintained
 F:	include/linux/pnp.h
 F:	drivers/pnp/