intel_idle: no longer EXPERIMENTAL

This is a fully supported driver.

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/idle/Kconfig b/drivers/idle/Kconfig
index 82e4e86..8489eb5 100644
--- a/drivers/idle/Kconfig
+++ b/drivers/idle/Kconfig
@@ -3,7 +3,6 @@
 	depends on CPU_IDLE
 	depends on X86
 	depends on CPU_SUP_INTEL
-	depends on EXPERIMENTAL
 	help
 	  Enable intel_idle, a cpuidle driver that includes knowledge of
 	  native Intel hardware idle features.  The acpi_idle driver