[ISAPNP] Unmark experimental status

ISAPnP support has been stable with the new pnp layer for a while.
This patch removes the experimental dependency.

drivers/pnp/isapnp/Kconfig

@@ -2,8 +2,8 @@
 # ISA Plug and Play configuration
 #
 config ISAPNP
-	bool "ISA Plug and Play support (EXPERIMENTAL)"
-	depends on PNP && EXPERIMENTAL
+	bool "ISA Plug and Play support"
+	depends on PNP
 	help
 	  Say Y here if you would like support for ISA Plug and Play devices.
 	  Some information is in <file:Documentation/isapnp.txt>.