media: em28xx: Increase max em28xx boards to max dvb adapters

Maximum 4 em28xx boards is too low, this can be maxed out by two devices.
This allows all the dvb adapters in the system to be em28xx if so desired.
Signed-off-by: Brad Love <brad@nextdimension.cc>
Reviewed-by: Michael Ira Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/em28xx/em28xx.h

@@ -166,7 +166,7 @@
 #define EM28XX_STOP_AUDIO       0
 
 /* maximum number of em28xx boards */
-#define EM28XX_MAXBOARDS 4 /*FIXME: should be bigger */
+#define EM28XX_MAXBOARDS DVB_MAX_ADAPTERS /* All adapters could be em28xx */
 
 /* maximum number of frames that can be queued */
 #define EM28XX_NUM_FRAMES 5