samples: Bluetooth: iso_broadcast: Restrict max stream sync

Restrict possible maximum stream synchronization to
implementation defined 2 stream, as structure declarations
in the implementation is limited to 2.

Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

samples/bluetooth/iso_receive/src/main.c

@@ -22,7 +22,7 @@
 
 #define PA_RETRY_COUNT 6
 
-#define BIS_ISO_CHAN_COUNT 2
+#define BIS_ISO_CHAN_COUNT MIN(2U, CONFIG_BT_ISO_MAX_CHAN)
 
 static bool         per_adv_found;
 static bool         per_adv_lost;