staging: echo: move to drivers/misc/

The code is clean, there are users of it, so it doesn't belong in
staging anymore, move it to drivers/misc/.

Cc: Steve Underwood <steveu@coppice.org>
Cc: David Rowe <david@rowetel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/misc/Kconfig
Simple merge

diff --cc drivers/misc/Makefile
Simple merge

diff --cc drivers/misc/echo/Kconfig
Simple merge

diff --cc drivers/misc/echo/Makefile
Simple merge

diff --cc drivers/misc/echo/echo.c
Simple merge

diff --cc drivers/misc/echo/echo.h
Simple merge

diff --cc drivers/misc/echo/fir.h
Simple merge

diff --cc drivers/misc/echo/oslec.h
Simple merge

diff --cc drivers/staging/Kconfig
Simple merge

diff --cc drivers/staging/Makefile
Simple merge

diff --cc drivers/staging/echo/TODO
Simple merge