V4L/DVB (3495): Kconfig: select VIDEO_CX25840 to build cx25840 a/v decoder module

The cx25840 module requires external firmware in order to function,
so it must select FW_LOADER, but saa7115 and saa7129 do not require it.
This patch creates VIDEO_CX25840, and alters VIDEO_DECODER to select it.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/cx25840/Kconfig b/drivers/media/video/cx25840/Kconfig
new file mode 100644
index 0000000..854264e
--- /dev/null
+++ b/drivers/media/video/cx25840/Kconfig
@@ -0,0 +1,9 @@
+config VIDEO_CX25840
+	tristate "Conexant CX2584x audio/video decoders"
+	depends on VIDEO_DEV && I2C && EXPERIMENTAL
+	select FW_LOADER
+	---help---
+	  Support for the Conexant CX2584x audio/video decoders.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cx25840