oprofile: remove EXPERIMENTAL from the config option description

OProfile is already used for a long time and no longer experimental.

Signed-off-by: Robert Richter <robert.richter@amd.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index 25e69f7..d677872 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -3,7 +3,7 @@
 #
 
 config OPROFILE
-	tristate "OProfile system profiling (EXPERIMENTAL)"
+	tristate "OProfile system profiling"
 	depends on PROFILING
 	depends on HAVE_OPROFILE
 	select RING_BUFFER