staging: fbtft: add flexfb driver

This commit adds the flexfb driver from the fbtft project at
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>

drivers/staging/fbtft/Kconfig

@@ -157,3 +157,9 @@ config FB_TFT_WATTEROTT
 	depends on FB_TFT
 	help
 	  Generic Framebuffer support for WATTEROTT
+
+config FB_FLEX
+	tristate "Generic FB driver for TFT LCD displays"
+	depends on FB_TFT
+	help
+	  Generic Framebuffer support for TFT LCD displays.

drivers/staging/fbtft/Makefile

@@ -28,3 +28,4 @@ obj-$(CONFIG_FB_TFT_TLS8204)     += fb_tls8204.o
 obj-$(CONFIG_FB_TFT_UC1701)      += fb_uc1701.o
 obj-$(CONFIG_FB_TFT_UPD161704)   += fb_upd161704.o
 obj-$(CONFIG_FB_TFT_WATTEROTT)   += fb_watterott.o
+obj-$(CONFIG_FB_FLEX)            += flexfb.o