Revert "staging/lustre: drop CONFIG_BROKEN dependency"

This reverts commit 52f63175.

It's still broken, especially for a simple build on x86 with 'make
allmodconfig'

As no fixes seem forthcoming, just mark it broken.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Peng Tao <tao.peng@emc.com>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/Kconfig

 config LUSTRE_FS
 	tristate "Lustre file system client support"
-	depends on STAGING && INET
+	depends on STAGING && INET && BROKEN
 	select LNET
 	help
 	  This option enables Lustre file system client support. Choose Y