b43: move under broadcom vendor directory

Part of reorganising wireless drivers directory and Kconfig.

Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2f3ea01..6879377 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2081,7 +2081,7 @@
 L:	b43-dev@lists.infradead.org
 W:	http://wireless.kernel.org/en/users/Drivers/b43
 S:	Odd Fixes
-F:	drivers/net/wireless/b43/
+F:	drivers/net/wireless/broadcom/b43/
 
 B43LEGACY WIRELESS DRIVER
 M:	Larry Finger <Larry.Finger@lwfinger.net>