mwl8k: move under marvell 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 5b889f6..e622877 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6734,7 +6734,7 @@
 M:	Lennert Buytenhek <buytenh@wantstofly.org>
 L:	linux-wireless@vger.kernel.org
 S:	Odd Fixes
-F:	drivers/net/wireless/mwl8k.c
+F:	drivers/net/wireless/marvell/mwl8k.c
 
 MARVELL SOC MMC/SD/SDIO CONTROLLER DRIVER
 M:	Nicolas Pitre <nico@fluxnic.net>