Staging: tty: fix build with epca.c driver

I forgot to move the digi*.h files from drivers/char/ to
drivers/staging/tty/

Thanks to Randy for pointing out the issue.

Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/digi1.h b/drivers/staging/tty/digi1.h
similarity index 100%
rename from drivers/char/digi1.h
rename to drivers/staging/tty/digi1.h

diff --git a/drivers/char/digiFep1.h b/drivers/staging/tty/digiFep1.h
similarity index 100%
rename from drivers/char/digiFep1.h
rename to drivers/staging/tty/digiFep1.h

diff --git a/drivers/char/digiPCI.h b/drivers/staging/tty/digiPCI.h
similarity index 100%
rename from drivers/char/digiPCI.h
rename to drivers/staging/tty/digiPCI.h