Staging: dt3155v4l: add driver to the build

The last patch forgot to add the driver to the Makefile, so it
would not end up getting built.  This resolves that issue.

Cc: Marin Mitov <mitov@issp.bas.bg>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/Makefile

@@ -50,6 +50,7 @@ obj-$(CONFIG_PCMCIA_WAVELAN)	+= wavelan/
 obj-$(CONFIG_PCMCIA_NETWAVE)	+= netwave/
 obj-$(CONFIG_FB_SM7XX)		+= sm7xx/
 obj-$(CONFIG_DT3155)		+= dt3155/
+obj-$(CONFIG_VIDEO_DT3155)	+= dt3155v4l/
 obj-$(CONFIG_CRYSTALHD)		+= crystalhd/
 obj-$(CONFIG_CXT1E1)		+= cxt1e1/
 obj-$(CONFIG_TI_ST)		+= ti-st/