staging: bcm: Fix quoted string split across lines warning

The following patch the checkpatch.pl warning:

drivers/staging/bcm/InterfaceIdleMode.c:215: warning:quoted string split across lines

Signed-off-by: Yeliz Taneroglu <yeliztaneroglu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>