staging: ft1000: Rename ft1000_chdev.c to ft1000_debug.c.

Name of old file was misleading because it is currently
updated to debugfs so change also file name.
Signed-off-by: NMarek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/ft1000/ft1000-usb/Makefile

 obj-$(CONFIG_FT1000_USB) += ft1000.o
 
-ft1000-y := ft1000_chdev.o ft1000_download.o ft1000_hw.o ft1000_proc.o ft1000_usb.o
+ft1000-y := ft1000_debug.o ft1000_download.o ft1000_hw.o ft1000_proc.o ft1000_usb.o