Hoist memcpy_fromiovec/memcpy_toiovec into lib/

ERROR: "memcpy_fromiovec" [drivers/vhost/vhost_scsi.ko] undefined!

That function is only present with CONFIG_NET.  Turns out that
crypto/algif_skcipher.c also uses that outside net, but it actually
needs sockets anyway.

In addition, commit 6d4f0139d6 added
CONFIG_NET dependency to CONFIG_VMCI for memcpy_toiovec, so hoist
that function and revert that commit too.

socket.h already includes uio.h, so no callers need updating; trying
only broke things fo x86_64 randconfig (thanks Fengguang!).

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/misc/vmw_vmci/Kconfig

@@ -4,7 +4,7 @@
 
 config VMWARE_VMCI
 	tristate "VMware VMCI Driver"
-	depends on X86 && PCI && NET
+	depends on X86 && PCI
 	help
 	  This is VMware's Virtual Machine Communication Interface.  It enables
 	  high-speed communication between host and guest in a virtual

drivers/misc/vmw_vmci/vmci_queue_pair.c

@@ -23,7 +23,7 @@
 #include <linux/pagemap.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
-#include <linux/socket.h>
+#include <linux/uio.h>
 #include <linux/wait.h>
 #include <linux/vmalloc.h>