staging: greybus: remove README and LICENSE

We don't need yet-another-copy of the GPLv2 in the tree, and the README
is now pointless, so remove both of these files.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/README

-Greybus kernel code
-
-To build against the running kernel (odds are you don't want this):
-	make
-
-To build against a specific kernel source tree (odds are you want this):
-	KERNELDIR=/home/some/random/place make
-
-Any questions / concerns about this code base, please email:
-	Greg Kroah-Hartman <greg@kroah.com>