cx25821: Add driver to the building system

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index c30093b..b1cad0d 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -6,6 +6,7 @@
 obj-$(CONFIG_ET131X)		+= et131x/
 obj-$(CONFIG_SLICOSS)		+= slicoss/
 obj-$(CONFIG_VIDEO_GO7007)	+= go7007/
+obj-$(CONFIG_VIDEO_CX25821)	+= cx25821/
 obj-$(CONFIG_USB_IP_COMMON)	+= usbip/
 obj-$(CONFIG_W35UND)		+= winbond/
 obj-$(CONFIG_PRISM2_USB)	+= wlan-ng/