Kconfig: Use a short, consistent style for prompts

Consistently use

    config FOO
            bool/int/hex/string "Prompt text"

instead of

    config FOO
            bool/int/hex/string
            prompt "Prompt text"

(...and a bunch of other variations that e.g. swapped the order of the
type and the 'prompt', or put other properties between them).

The shorthand is fully equivalent to using 'prompt'. It saves lines and
avoids tricking people into thinking there is some semantic difference.

Most of the grunt work was done by a modified version of
https://unix.stackexchange.com/questions/26284/
how-can-i-use-sed-to-replace-a-multi-line-string/26290#26290, but some
of the rarer variations had to be converted manually.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

lib/Kconfig

@@ -9,23 +9,20 @@ source "lib/libc/Kconfig"
 menu "Additional libraries"
 
 config JSON_LIBRARY
-	bool
-	prompt "Build JSON library"
+	bool "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"
+	bool "Enable ring buffers"
 	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.
 
 config BASE64
-	bool
-	prompt "Enable base64 encoding and decoding"
+	bool "Enable base64 encoding and decoding"
 	help
 	  Enable base64 encoding and decoding functionality