lib: move ring_buffer Kconfig to lib/, cleanup lib/Kconfig

* ring_bufffer is in lib, so move the Kconfig out of the kernel.
* move one Kconfig used for json to lib/Kconfig alongside other
  Kconfigs.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

kernel/Kconfig

@@ -451,15 +451,6 @@ config XIP
 	  supply a linker command file when building your image. Enabling this
 	  option increases both the code and data footprint of the image.
 
-config RING_BUFFER
-	bool
-	prompt "Enable ring buffers"
-	default n
-	help
-	  Enable usage of ring buffers. This is similar to kernel FIFOs but ring
-	  buffers manage their own buffer memory and can store arbitrary data.
-	  For optimal performance, use buffer sizes that are a power of 2.
-
 menu "Initialization Priorities"
 
 config KERNEL_INIT_PRIORITY_OBJECTS

lib/Kconfig

@@ -6,4 +6,22 @@
 
 source "lib/libc/Kconfig"
 
-source "lib/json/Kconfig"
+menu "Additional libraries"
+
+config JSON_LIBRARY
+	bool
+	default N
+	prompt "Build JSON library"
+	help
+	  Build a minimal JSON parsing/encoding library. Used by sample
+	  applications such as the NATS client.
+
+config RING_BUFFER
+	bool
+	prompt "Enable ring buffers"
+	default n
+	help
+	  Enable usage of ring buffers. This is similar to kernel FIFOs but ring
+	  buffers manage their own buffer memory and can store arbitrary data.
+	  For optimal performance, use buffer sizes that are a power of 2.
+endmenu

lib/json/Kconfig

@@ -1,19 +0,0 @@
-# Kconfig - JSON library
-
-#
-# Copyright (c) 2016 Intel Corporation
-#
-# SPDX-License-Identifier: Apache-2.0
-#
-
-menu "Additional libraries"
-
-config JSON_LIBRARY
-	bool
-	default N
-	prompt "Build JSON library"
-	help
-	  Build a minimal JSON parsing/encoding library. Used by sample
-	  applications such as the NATS client.
-
-endmenu