staging: bcm2835-audio: use braces on all arms of statement

Add braces on all arms of the if-else statements in bcm2835-vchiq.c to
comply with kernel coding style.

Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>