staging: dgap: Rename driver

Renames driver file dgap_driver.c and dgap_driver.h to
dgap.c and dgap.h because we are now single source and
include file and better fits kernel naming conventions.

Signed-off-by: Mark Hounschell <markh@compro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgap/Makefile

@@ -1,5 +1 @@
 obj-$(CONFIG_DGAP) += dgap.o
-
-
-dgap-objs :=	dgap_driver.o 
-

drivers/staging/dgap/dgap.c

@@ -49,7 +49,7 @@
 #include <linux/device.h>
 #include <linux/kdev_t.h>
 
-#include "dgap_driver.h"
+#include "dgap.h"
 
 #define init_MUTEX(sem)         sema_init(sem, 1)
 #define DECLARE_MUTEX(name)     \