SUNRPC xptrdma: simplify build configuration

Trond and Bruce,

This is a patch for 2.6.25. This is the same version that was sent out
on December 12 for review (no comments to date).

To simplify the RPC/RDMA client and server build configuration, make
SUNRPC_XPRT_RDMA a hidden config option that continues to depend on
SUNRPC and INFINIBAND. The value of SUNRPC_XPRT_RDMA will be:

- N if either SUNRPC or INFINIBAND are N
- M if both SUNRPC and INFINIBAND are on (M or Y) and at least one is M
- Y if both SUNRPC and INFINIBAND are Y

In 2.6.25, all of the RPC/RDMA related files are grouped in
net/sunrpc/xprtrdma and the net/sunrpc/xprtrdma/Makefile builds both
the client and server RPC/RDMA support using this config option.

Signed-off-by: James Lentini <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

fs/Kconfig

···
 	tristate
 
 config SUNRPC_XPRT_RDMA
-	tristate "RDMA transport for sunrpc (EXPERIMENTAL)"
+	tristate
 	depends on SUNRPC && INFINIBAND && EXPERIMENTAL
-	default m
-	help
-	  Adds a client RPC transport for supporting kernel NFS over RDMA
-	  mounts, including Infiniband and iWARP. Experimental.
+	default SUNRPC && INFINIBAND
 
 config SUNRPC_BIND34
 	bool "Support for rpcbind versions 3 & 4 (EXPERIMENTAL)"