staging: fbtft: core support

This commit adds the core fbtft framework from
https://github.com/notro/fbtft.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Noralf Tronnes <notro@tronnes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/Kconfig
Simple merge

diff --cc drivers/staging/Makefile
Simple merge

diff --cc drivers/staging/fbtft/Kconfig
Simple merge

diff --cc drivers/staging/fbtft/Makefile
Simple merge

diff --cc drivers/staging/fbtft/README
Simple merge

diff --cc drivers/staging/fbtft/fbtft-bus.c
Simple merge

diff --cc drivers/staging/fbtft/fbtft-core.c
Simple merge

diff --cc drivers/staging/fbtft/fbtft-io.c
Simple merge

diff --cc drivers/staging/fbtft/fbtft-sysfs.c
Simple merge

diff --cc drivers/staging/fbtft/fbtft.h
Simple merge