staging: bcm: fix error do not use c99 comments

This patch fixes checkpatch.pl error in InterfaceMacros.h file
ERROR: do not use C99 // comments
Signed-off-by: NTapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/bcm/InterfaceMacros.h

@@ -10,7 +10,7 @@
 
 #define MAX_DATA_BUFFER_SIZE    2048
 
-//Num of Asynchronous reads pending
+/* Num of Asynchronous reads pending */
 #define NUM_RX_DESC 64
 
 #define SYS_CFG 0x0F000C00