staging: bcm2835-audio: Enclose complex macro value in parentheses

This patch fixes the checkpatch.pl error:

ERROR: Macros with complex values should be enclosed in parentheses

Signed-off-by: Diego Roux <me@diegoroux04.dynv6.net>
Link: https://lore.kernel.org/r/20210716024909.39411-1-me@diegoroux04.dynv6.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>