bcma: drop unneeded initialization value

Do not initialise statics to 0
ERROR found by checkpatch.pl

Signed-off-by: Sohaib Mohamed <sohaib.amhmd@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210930194920.15847-1-sohaib.amhmd@gmail.com